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
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
|
/* $OpenBSD: table_ldap.c,v 1.6 2013/07/22 13:14:49 eric Exp $ */
/*
* Copyright (c) 2013 Eric Faurot <eric@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "smtpd-defines.h"
#include "smtpd-api.h"
#include "log.h"
#include "aldap.h"
#define MAX_LDAP_IDENTIFIER 32
#define MAX_LDAP_URL 256
#define MAX_LDAP_USERNAME 256
#define MAX_LDAP_PASSWORD 256
#define MAX_LDAP_BASELEN 128
#define MAX_LDAP_FILTERLEN 1024
#define MAX_LDAP_FIELDLEN 128
enum {
LDAP_ALIAS = 0,
LDAP_DOMAIN,
LDAP_CREDENTIALS,
LDAP_NETADDR,
LDAP_USERINFO,
LDAP_SOURCE,
LDAP_MAILADDR,
LDAP_ADDRNAME,
LDAP_MAX
};
#define MAX_ATTRS 6
struct query {
char *filter;
char *attrs[MAX_ATTRS];
int attrn;
};
static int table_ldap_update(void);
static int table_ldap_check(int, const char *);
static int table_ldap_lookup(int, const char *, char *, size_t);
static int table_ldap_fetch(int, char *, size_t);
static int ldap_config(void);
static int ldap_open(void);
static int ldap_query(const char *, char **, char ***, size_t);
static int ldap_parse_attributes(char **, const char *, const char *, size_t);
static int ldap_run_query(int type, const char *, char *, size_t);
static char *config;
static char *url;
static char *username;
static char *password;
static char *basedn;
static struct aldap *aldap;
static struct query queries[LDAP_MAX];
int
main(int argc, char **argv)
{
int ch;
log_init(1);
log_verbose(~0);
while ((ch = getopt(argc, argv, "")) != -1) {
switch (ch) {
default:
log_warnx("warn: table-ldap: bad option");
return (1);
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
log_warnx("warn: table-ldap: bogus argument(s)");
return (1);
}
config = argv[0];
if (!ldap_config()) {
log_warnx("warn: table-ldap: could not parse config");
return (1);
}
log_debug("debug: table-ldap: done reading config");
if (!ldap_open()) {
log_warnx("warn: table-ldap: failed to connect");
return (1);
}
log_debug("debug: table-ldap: connected");
table_api_on_update(table_ldap_update);
table_api_on_check(table_ldap_check);
table_api_on_lookup(table_ldap_lookup);
table_api_on_fetch(table_ldap_fetch);
table_api_dispatch();
return (0);
}
static int
table_ldap_update(void)
{
return (1);
}
static int
table_ldap_check(int service, const char *key)
{
switch(service) {
case K_ALIAS:
case K_DOMAIN:
case K_CREDENTIALS:
case K_USERINFO:
return ldap_run_query(service, key, NULL, 0);
default:
return (-1);
}
}
static int
table_ldap_lookup(int service, const char *key, char *dst, size_t sz)
{
switch(service) {
case K_ALIAS:
case K_DOMAIN:
case K_CREDENTIALS:
case K_USERINFO:
return ldap_run_query(service, key, dst, sz);
default:
return (-1);
}
}
static int
table_ldap_fetch(int service, char *dst, size_t sz)
{
return (-1);
}
static struct aldap *
ldap_connect(const char *addr)
{
struct aldap_url lu;
struct addrinfo hints, *res0, *res;
char *buf;
int error, fd = -1;
if ((buf = strdup(addr)) == NULL)
return (NULL);
/* XXX buf leak */
if (aldap_parse_url(buf, &lu) != 1) {
log_warnx("warn: table-ldap: ldap_parse_url fail");
return (NULL);
}
bzero(&hints, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM; /* DUMMY */
error = getaddrinfo(lu.host, NULL, &hints, &res0);
if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
return (NULL);
if (error) {
log_warnx("warn: table-ldap: could not parse \"%s\": %s",
lu.host, gai_strerror(error));
return (NULL);
}
for (res = res0; res; res = res->ai_next) {
if (res->ai_family != AF_INET && res->ai_family != AF_INET6)
continue;
fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (fd == -1)
continue;
if (res->ai_family == AF_INET) {
struct sockaddr_in sin4 = *(struct sockaddr_in *)res->ai_addr;
sin4.sin_port = htons(lu.port);
if (connect(fd, (struct sockaddr *)&sin4, res->ai_addrlen) == 0)
return aldap_init(fd);
}
else if (res->ai_family == AF_INET6) {
struct sockaddr_in6 sin6 = *(struct sockaddr_in6 *)res->ai_addr;
sin6.sin6_port = htons(lu.port);
if (connect(fd, (struct sockaddr *)&sin6, res->ai_addrlen) == 0)
return aldap_init(fd);
}
close(fd);
fd = -1;
}
return (NULL);
}
static int
read_value(char **store, const char *key, const char *value)
{
log_debug("debug: table-ldap: reading key \"%s\" -> \"%s\"",
key, value);
if (*store) {
log_warnx("warn: table-ldap: duplicate key %s", key);
return (0);
}
if ((*store = strdup(value)) == NULL) {
log_warn("warn: table-ldap: strdup");
return (0);
}
return (1);
}
static int
ldap_parse_attributes(char **attributes, const char *key, const char *line,
size_t expect)
{
char buffer[1024];
char *p;
size_t m, n;
log_debug("debug: table-ldap: parsing attribute \"%s\" (%zu) -> \"%s\"",
key, expect, line);
if (strlcpy(buffer, line, sizeof buffer) >= sizeof buffer)
return (0);
m = 1;
for (p = buffer; *p; ++p) {
if (*p == ',') {
*p = 0;
m++;
}
}
if (expect != m)
return (0);
p = buffer;
for (n = 0; n < expect; ++n)
attributes[n] = NULL;
for (n = 0; n < m; ++n) {
attributes[n] = strdup(p);
if (attributes[n] == NULL) {
log_warnx("warn: table-ldap: strdup");
return (0); /* XXX cleanup */
}
p += strlen(p) + 1;
}
return (1);
}
static int
ldap_config(void)
{
size_t flen;
FILE *fp;
char *key, *value, *buf, *lbuf;
fp = fopen(config, "r");
if (fp == NULL)
return (0);
lbuf = NULL;
while ((buf = fgetln(fp, &flen))) {
if (buf[flen - 1] == '\n')
buf[flen - 1] = '\0';
else {
lbuf = malloc(flen + 1);
if (lbuf == NULL) {
log_warn("warn: table-ldap: malloc");
return (0);
}
memcpy(lbuf, buf, flen);
lbuf[flen] = '\0';
buf = lbuf;
}
key = buf;
while (isspace((int)*key))
++key;
if (*key == '\0' || *key == '#')
continue;
value = key;
strsep(&value, " \t:");
if (value) {
while (*value) {
if (!isspace(*value) &&
!(*value == ':' && isspace(*(value + 1))))
break;
++value;
}
if (*value == '\0')
value = NULL;
}
if (value == NULL) {
log_warnx("warn: table-ldap: missing value for key %s", key);
continue;
}
if (!strcmp(key, "url"))
read_value(&url, key, value);
else if (!strcmp(key, "username"))
read_value(&username, key, value);
else if (!strcmp(key, "password"))
read_value(&password, key, value);
else if (!strcmp(key, "basedn"))
read_value(&basedn, key, value);
else if (!strcmp(key, "alias_filter"))
read_value(&queries[LDAP_ALIAS].filter, key, value);
else if (!strcmp(key, "alias_attributes"))
ldap_parse_attributes(queries[LDAP_ALIAS].attrs,
key, value, 1);
else if (!strcmp(key, "credentials_filter"))
read_value(&queries[LDAP_CREDENTIALS].filter, key, value);
else if (!strcmp(key, "credentials_attributes"))
ldap_parse_attributes(queries[LDAP_CREDENTIALS].attrs,
key, value, 2);
else if (!strcmp(key, "domain_filter"))
read_value(&queries[LDAP_DOMAIN].filter, key, value);
else if (!strcmp(key, "domain_attributes"))
ldap_parse_attributes(queries[LDAP_DOMAIN].attrs,
key, value, 1);
else if (!strcmp(key, "userinfo_filter"))
read_value(&queries[LDAP_USERINFO].filter, key, value);
else if (!strcmp(key, "userinfo_attributes"))
ldap_parse_attributes(queries[LDAP_USERINFO].attrs,
key, value, 4);
else
log_warnx("warn: table-ldap: bogus entry \"%s\"", key);
}
free(lbuf);
fclose(fp);
return (1);
}
static int
ldap_open(void)
{
struct aldap_message *amsg = NULL;
aldap = ldap_connect(url);
if (aldap == NULL) {
log_warnx("warn: table-ldap: ldap_connect error");
goto err;
}
if (aldap_bind(aldap, username, password) == -1) {
log_warnx("warn: table-ldap: aldap_bind error");
goto err;
}
if ((amsg = aldap_parse(aldap)) == NULL) {
log_warnx("warn: table-ldap: aldap_parse");
goto err;
}
switch (aldap_get_resultcode(amsg)) {
case LDAP_SUCCESS:
log_debug("debug: table-ldap: ldap server accepted credentials");
break;
case LDAP_INVALID_CREDENTIALS:
log_warnx("warn: table-ldap: ldap server refused credentials");
goto err;
default:
log_warnx("warn: table-ldap: failed to bind, result #%d",
aldap_get_resultcode(amsg));
goto err;
}
if (amsg)
aldap_freemsg(amsg);
return (1);
err:
if (aldap)
aldap_close(aldap);
if (amsg)
aldap_freemsg(amsg);
return (0);
}
static int
ldap_query(const char *filter, char **attributes, char ***outp, size_t n)
{
struct aldap_message *m = NULL;
struct aldap_page_control *pg = NULL;
int ret, found;
size_t i;
char basedn__[MAX_LDAP_BASELEN];
char filter__[MAX_LDAP_FILTERLEN];
if (strlcpy(basedn__, basedn, sizeof basedn__) >= sizeof basedn__)
return -1;
if (strlcpy(filter__, filter, sizeof filter__) >= sizeof filter__)
return -1;
found = 0;
do {
if ((ret = aldap_search(aldap, basedn__, LDAP_SCOPE_SUBTREE,
filter__, NULL, 0, 0, 0, pg)) == -1) {
return -1;
}
if (pg != NULL) {
aldap_freepage(pg);
pg = NULL;
}
while ((m = aldap_parse(aldap)) != NULL) {
if (aldap->msgid != m->msgid)
goto error;
if (m->message_type == LDAP_RES_SEARCH_RESULT) {
if (m->page != NULL && m->page->cookie_len)
pg = m->page;
aldap_freemsg(m);
m = NULL;
break;
}
if (m->message_type != LDAP_RES_SEARCH_ENTRY)
goto error;
found = 1;
for (i = 0; i < n; ++i)
if (aldap_match_attr(m, attributes[i], &outp[i]) != 1)
goto error;
aldap_freemsg(m);
m = NULL;
}
} while (pg != NULL);
ret = found ? 1 : 0;
goto end;
error:
ret = -1;
end:
if (m)
aldap_freemsg(m);
log_debug("debug: table_ldap_internal_query: filter=%s, ret=%d", filter, ret);
return ret;
}
static int
ldap_run_query(int type, const char *key, char *dst, size_t sz)
{
struct query *q;
char **res[4], filter[MAX_LDAP_FILTERLEN];
int ret, i;
switch (type) {
case K_ALIAS: q = &queries[LDAP_ALIAS]; break;
case K_DOMAIN: q = &queries[LDAP_DOMAIN]; break;
case K_CREDENTIALS: q = &queries[LDAP_CREDENTIALS]; break;
case K_NETADDR: q = &queries[LDAP_NETADDR]; break;
case K_USERINFO: q = &queries[LDAP_USERINFO]; break;
case K_SOURCE: q = &queries[LDAP_SOURCE]; break;
case K_MAILADDR: q = &queries[LDAP_MAILADDR]; break;
case K_ADDRNAME: q = &queries[LDAP_ADDRNAME]; break;
default:
return (-1);
}
if (snprintf(filter, sizeof(filter), q->filter, key)
>= (int)sizeof(filter)) {
log_warnx("warn: table-ldap: filter too large");
return (-1);
}
bzero(res, sizeof(res));
ret = ldap_query(filter, q->attrs, res, q->attrn);
if (ret <= 0 || dst == NULL)
goto end;
switch (type) {
case K_ALIAS:
for (i = 0; res[0][i]; i++) {
if (i && strlcat(dst, ", ", sz) >= sz) {
ret = -1;
break;
}
if (strlcat(dst, res[0][i], sz) >= sz) {
ret = -1;
break;
}
}
break;
case K_DOMAIN:
if (strlcpy(dst, res[0][0], sz) >= sz)
ret = -1;
break;
case K_CREDENTIALS:
if (snprintf(dst, sz, "%s:%s", res[0][0], res[0][1]) >= (int)sz)
ret = -1;
break;
case K_USERINFO:
if (snprintf(dst, sz, "%s:%s:%s:%s", res[0][0], res[1][0],
res[2][0], res[3][0]) >= (int)sz)
ret = -1;
break;
}
if (ret == -1)
log_warnx("warn: table-ldap: could not format result");
end:
for (i = 0; i < q->attrn; ++i)
if (res[i])
aldap_free_attr(res[i]);
return (ret);
}
|