1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* 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 <http://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 "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;
}
}
|
