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ldap-parse-uri.c
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/* ldap-parse-uri.c - Parse an LDAP URI.
* Copyright (C) 2015 g10 Code GmbH
*
* 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/>.
*/
#include <config.h>
#include <gpg-error.h>
#ifdef HAVE_W32_SYSTEM
# include "ldap-url.h"
#else
# include <ldap.h>
#endif
#include "../common/util.h"
#include "http.h"
/* Returns 1 if the string is an LDAP URL (begins with ldap:, ldaps:
or ldapi:). */
int
ldap_uri_p (const char *url)
{
char *colon = strchr (url, ':');
if (! colon)
return 0;
else
{
int offset = (uintptr_t) colon - (uintptr_t) url;
if (/* All lower case. */
(offset == 4 && memcmp (url, "ldap", 4) == 0)
|| (offset == 5
&& (memcmp (url, "ldaps", 5) == 0
&& memcmp (url, "ldapi", 5) == 0))
/* Mixed case. */
|| ((url[0] == 'l' || url[0] == 'L')
&& (url[1] == 'd' || url[1] == 'D')
&& (url[2] == 'a' || url[2] == 'A')
&& (url[3] == 'p' || url[3] == 'P')
&& (url[4] == ':'
|| ((url[4] == 's' || url[4] == 'S'
|| url[4] == 'i' || url[4] == 'i')
&& url[5] == ':'))))
return 1;
return 0;
}
}
/* Parse a URI and put the result into *purip. On success the
caller must use http_release_parsed_uri() to releases the resources.
uri->path is the base DN (or NULL for the default).
uri->auth is the bindname (or NULL for none).
The uri->query variable "password" is the password.
Note: any specified scope, any attributes, any filter and any
unknown extensions are simply ignored. */
gpg_error_t
ldap_parse_uri (parsed_uri_t *purip, const char *uri)
{
gpg_err_code_t err = 0;
parsed_uri_t puri = NULL;
int result;
LDAPURLDesc *lud = NULL;
char *scheme = NULL;
char *host = NULL;
char *dn = NULL;
char *bindname = NULL;
char *password = NULL;
char **s;
char *buffer;
int len;
result = ldap_url_parse (uri, &lud);
if (result != 0)
{
log_error ("Unable to parse LDAP uri '%s'\n", uri);
err = GPG_ERR_GENERAL;
goto out;
}
scheme = lud->lud_scheme;
host = lud->lud_host;
dn = lud->lud_dn;
for (s = lud->lud_exts; s && *s; s ++)
{
if (strncmp (*s, "bindname=", 9) == 0)
{
if (bindname)
log_error ("bindname given multiple times in URL '%s', ignoring.\n",
uri);
else
bindname = *s + 9;
}
else if (strncmp (*s, "password=", 9) == 0)
{
if (password)
log_error ("password given multiple times in URL '%s', ignoring.\n",
uri);
else
password = *s + 9;
}
else
log_error ("Unhandled extension (%s) in URL '%s', ignoring.",
*s, uri);
}
len = 0;
#define add(s) do { if (s) len += strlen (s) + 1; } while (0)
add (scheme);
add (host);
add (dn);
add (bindname);
add (password);
puri = xtrycalloc (1, sizeof *puri + len);
if (! puri)
{
err = gpg_err_code_from_syserror ();
goto out;
}
buffer = puri->buffer;
#define copy(to, s) \
do \
{ \
if (s) \
{ \
to = buffer; \
buffer = stpcpy (buffer, s) + 1; \
} \
} \
while (0)
copy (puri->scheme, scheme);
/* Make sure the scheme is lower case. */
ascii_strlwr (puri->scheme);
copy (puri->host, host);
copy (puri->path, dn);
copy (puri->auth, bindname);
if (password)
{
puri->query = calloc (sizeof (*puri->query), 1);
if (!puri->query)
{
err = gpg_err_code_from_syserror ();
goto out;
}
puri->query->name = "password";
copy (puri->query->value, password);
puri->query->valuelen = strlen (password) + 1;
}
puri->use_tls = strcmp (puri->scheme, "ldaps") == 0;
puri->port = lud->lud_port;
out:
if (lud)
ldap_free_urldesc (lud);
if (err)
{
if (puri)
http_release_parsed_uri (puri);
}
else
*purip = puri;
return gpg_err_make (default_errsource, err);
}
/* The following characters need to be escaped to be part of an LDAP
filter: *, (, ), \, NUL and /. Note: we don't handle NUL, since a
NUL can't be part of a C string.
This function always allocates a new string on success. It is the
caller's responsibility to free it.
*/
char *
ldap_escape_filter (const char *filter)
{
int l = strcspn (filter, "*()\\/");
if (l == strlen (filter))
/* Nothing to escape. */
return xstrdup (filter);
{
/* In the worst case we need to escape every letter. */
char *escaped = xmalloc (1 + 3 * strlen (filter));
/* Indices into filter and escaped. */
int filter_i = 0;
int escaped_i = 0;
for (filter_i = 0; filter_i < strlen (filter); filter_i ++)
{
switch (filter[filter_i])
{
case '*':
case '(':
case ')':
case '\\':
case '/':
snprintf (&escaped[escaped_i], 4, "%%%02x",
((const unsigned char *)filter)[filter_i]);
escaped_i += 3;
break;
default:
escaped[escaped_i ++] = filter[filter_i];
break;
}
}
/* NUL terminate it. */
escaped[escaped_i] = 0;
/* We could shrink escaped to be just escaped_i bytes, but the
result will probably be freed very quickly anyways. */
return escaped;
}
}

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