1 /* $NetBSD: util.c,v 1.3 2014/04/24 13:45:33 pettai Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "kadmin_locl.h"
37 #include <krb5/parse_units.h>
38
39 /*
40 * util.c - functions for parsing, unparsing, and editing different
41 * types of data used in kadmin.
42 */
43
44 static int
45 get_response(const char *prompt, const char *def, char *buf, size_t len);
46
47 /*
48 * attributes
49 */
50
51 struct units kdb_attrs[] = {
52 { "allow-digest", KRB5_KDB_ALLOW_DIGEST },
53 { "allow-kerberos4", KRB5_KDB_ALLOW_KERBEROS4 },
54 { "trusted-for-delegation", KRB5_KDB_TRUSTED_FOR_DELEGATION },
55 { "ok-as-delegate", KRB5_KDB_OK_AS_DELEGATE },
56 { "new-princ", KRB5_KDB_NEW_PRINC },
57 { "support-desmd5", KRB5_KDB_SUPPORT_DESMD5 },
58 { "pwchange-service", KRB5_KDB_PWCHANGE_SERVICE },
59 { "disallow-svr", KRB5_KDB_DISALLOW_SVR },
60 { "requires-pw-change", KRB5_KDB_REQUIRES_PWCHANGE },
61 { "requires-hw-auth", KRB5_KDB_REQUIRES_HW_AUTH },
62 { "requires-pre-auth", KRB5_KDB_REQUIRES_PRE_AUTH },
63 { "disallow-all-tix", KRB5_KDB_DISALLOW_ALL_TIX },
64 { "disallow-dup-skey", KRB5_KDB_DISALLOW_DUP_SKEY },
65 { "disallow-proxiable", KRB5_KDB_DISALLOW_PROXIABLE },
66 { "disallow-renewable", KRB5_KDB_DISALLOW_RENEWABLE },
67 { "disallow-tgt-based", KRB5_KDB_DISALLOW_TGT_BASED },
68 { "disallow-forwardable", KRB5_KDB_DISALLOW_FORWARDABLE },
69 { "disallow-postdated", KRB5_KDB_DISALLOW_POSTDATED },
70 { NULL, 0 }
71 };
72
73 /*
74 * convert the attributes in `attributes' into a printable string
75 * in `str, len'
76 */
77
78 void
attributes2str(krb5_flags attributes,char * str,size_t len)79 attributes2str(krb5_flags attributes, char *str, size_t len)
80 {
81 unparse_flags (attributes, kdb_attrs, str, len);
82 }
83
84 /*
85 * convert the string in `str' into attributes in `flags'
86 * return 0 if parsed ok, else -1.
87 */
88
89 int
str2attributes(const char * str,krb5_flags * flags)90 str2attributes(const char *str, krb5_flags *flags)
91 {
92 int res;
93
94 res = parse_flags (str, kdb_attrs, *flags);
95 if (res < 0)
96 return res;
97 else {
98 *flags = res;
99 return 0;
100 }
101 }
102
103 /*
104 * try to parse the string `resp' into attributes in `attr', also
105 * setting the `bit' in `mask' if attributes are given and valid.
106 */
107
108 int
parse_attributes(const char * resp,krb5_flags * attr,int * mask,int bit)109 parse_attributes (const char *resp, krb5_flags *attr, int *mask, int bit)
110 {
111 krb5_flags tmp = *attr;
112
113 if (str2attributes(resp, &tmp) == 0) {
114 *attr = tmp;
115 if (mask)
116 *mask |= bit;
117 return 0;
118 } else if(*resp == '?') {
119 print_flags_table (kdb_attrs, stderr);
120 } else {
121 fprintf (stderr, "Unable to parse \"%s\"\n", resp);
122 }
123 return -1;
124 }
125
126 /*
127 * allow the user to edit the attributes in `attr', prompting with `prompt'
128 */
129
130 int
edit_attributes(const char * prompt,krb5_flags * attr,int * mask,int bit)131 edit_attributes (const char *prompt, krb5_flags *attr, int *mask, int bit)
132 {
133 char buf[1024], resp[1024];
134
135 if (mask && (*mask & bit))
136 return 0;
137
138 attributes2str(*attr, buf, sizeof(buf));
139 for (;;) {
140 if(get_response("Attributes", buf, resp, sizeof(resp)) != 0)
141 return 1;
142 if (resp[0] == '\0')
143 break;
144 if (parse_attributes (resp, attr, mask, bit) == 0)
145 break;
146 }
147 return 0;
148 }
149
150 /*
151 * time_t
152 * the special value 0 means ``never''
153 */
154
155 /*
156 * Convert the time `t' to a string representation in `str' (of max
157 * size `len'). If include_time also include time, otherwise just
158 * date.
159 */
160
161 void
time_t2str(time_t t,char * str,size_t len,int include_time)162 time_t2str(time_t t, char *str, size_t len, int include_time)
163 {
164 if(t) {
165 if(include_time)
166 strftime(str, len, "%Y-%m-%d %H:%M:%S UTC", gmtime(&t));
167 else
168 strftime(str, len, "%Y-%m-%d", gmtime(&t));
169 } else
170 snprintf(str, len, "never");
171 }
172
173 /*
174 * Convert the time representation in `str' to a time in `time'.
175 * Return 0 if succesful, else -1.
176 */
177
178 int
str2time_t(const char * str,time_t * t)179 str2time_t (const char *str, time_t *t)
180 {
181 const char *p;
182 struct tm tm, tm2;
183
184 memset (&tm, 0, sizeof (tm));
185 memset (&tm2, 0, sizeof (tm2));
186
187 while(isspace((unsigned char)*str))
188 str++;
189
190 if (str[0] == '+') {
191 str++;
192 *t = parse_time(str, "month");
193 if (*t < 0)
194 return -1;
195 *t += time(NULL);
196 return 0;
197 }
198
199 if(strcasecmp(str, "never") == 0) {
200 *t = 0;
201 return 0;
202 }
203
204 if(strcasecmp(str, "now") == 0) {
205 *t = time(NULL);
206 return 0;
207 }
208
209 p = strptime (str, "%Y-%m-%d", &tm);
210
211 if (p == NULL)
212 return -1;
213
214 while(isspace((unsigned char)*p))
215 p++;
216
217 /* XXX this is really a bit optimistic, we should really complain
218 if there was a problem parsing the time */
219 if(p[0] != '\0' && strptime (p, "%H:%M:%S", &tm2) != NULL) {
220 tm.tm_hour = tm2.tm_hour;
221 tm.tm_min = tm2.tm_min;
222 tm.tm_sec = tm2.tm_sec;
223 } else {
224 /* Do it on the end of the day */
225 tm.tm_hour = 23;
226 tm.tm_min = 59;
227 tm.tm_sec = 59;
228 }
229
230 *t = tm2time (tm, 0);
231 return 0;
232 }
233
234 /*
235 * try to parse the time in `resp' storing it in `value'
236 */
237
238 int
parse_timet(const char * resp,krb5_timestamp * value,int * mask,int bit)239 parse_timet (const char *resp, krb5_timestamp *value, int *mask, int bit)
240 {
241 time_t tmp;
242
243 if (str2time_t(resp, &tmp) == 0) {
244 *value = tmp;
245 if(mask)
246 *mask |= bit;
247 return 0;
248 }
249 if(*resp != '?')
250 fprintf (stderr, "Unable to parse time \"%s\"\n", resp);
251 fprintf (stderr, "Print date on format YYYY-mm-dd [hh:mm:ss]\n");
252 return -1;
253 }
254
255 /*
256 * allow the user to edit the time in `value'
257 */
258
259 int
edit_timet(const char * prompt,krb5_timestamp * value,int * mask,int bit)260 edit_timet (const char *prompt, krb5_timestamp *value, int *mask, int bit)
261 {
262 char buf[1024], resp[1024];
263
264 if (mask && (*mask & bit))
265 return 0;
266
267 time_t2str (*value, buf, sizeof (buf), 0);
268
269 for (;;) {
270 if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
271 return 1;
272 if (parse_timet (resp, value, mask, bit) == 0)
273 break;
274 }
275 return 0;
276 }
277
278 /*
279 * deltat
280 * the special value 0 means ``unlimited''
281 */
282
283 /*
284 * convert the delta_t value in `t' into a printable form in `str, len'
285 */
286
287 void
deltat2str(unsigned t,char * str,size_t len)288 deltat2str(unsigned t, char *str, size_t len)
289 {
290 if(t == 0 || t == INT_MAX)
291 snprintf(str, len, "unlimited");
292 else
293 unparse_time(t, str, len);
294 }
295
296 /*
297 * parse the delta value in `str', storing result in `*delta'
298 * return 0 if ok, else -1
299 */
300
301 int
str2deltat(const char * str,krb5_deltat * delta)302 str2deltat(const char *str, krb5_deltat *delta)
303 {
304 int res;
305
306 if(strcasecmp(str, "unlimited") == 0) {
307 *delta = 0;
308 return 0;
309 }
310 res = parse_time(str, "day");
311 if (res < 0)
312 return res;
313 else {
314 *delta = res;
315 return 0;
316 }
317 }
318
319 /*
320 * try to parse the string in `resp' into a deltad in `value'
321 * `mask' will get the bit `bit' set if a value was given.
322 */
323
324 int
parse_deltat(const char * resp,krb5_deltat * value,int * mask,int bit)325 parse_deltat (const char *resp, krb5_deltat *value, int *mask, int bit)
326 {
327 krb5_deltat tmp;
328
329 if (str2deltat(resp, &tmp) == 0) {
330 *value = tmp;
331 if (mask)
332 *mask |= bit;
333 return 0;
334 } else if(*resp == '?') {
335 print_time_table (stderr);
336 } else {
337 fprintf (stderr, "Unable to parse time \"%s\"\n", resp);
338 }
339 return -1;
340 }
341
342 /*
343 * allow the user to edit the deltat in `value'
344 */
345
346 int
edit_deltat(const char * prompt,krb5_deltat * value,int * mask,int bit)347 edit_deltat (const char *prompt, krb5_deltat *value, int *mask, int bit)
348 {
349 char buf[1024], resp[1024];
350
351 if (mask && (*mask & bit))
352 return 0;
353
354 deltat2str(*value, buf, sizeof(buf));
355 for (;;) {
356 if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
357 return 1;
358 if (parse_deltat (resp, value, mask, bit) == 0)
359 break;
360 }
361 return 0;
362 }
363
364 /*
365 * allow the user to edit `ent'
366 */
367
368 void
set_defaults(kadm5_principal_ent_t ent,int * mask,kadm5_principal_ent_t default_ent,int default_mask)369 set_defaults(kadm5_principal_ent_t ent, int *mask,
370 kadm5_principal_ent_t default_ent, int default_mask)
371 {
372 if (default_ent
373 && (default_mask & KADM5_MAX_LIFE)
374 && !(*mask & KADM5_MAX_LIFE))
375 ent->max_life = default_ent->max_life;
376
377 if (default_ent
378 && (default_mask & KADM5_MAX_RLIFE)
379 && !(*mask & KADM5_MAX_RLIFE))
380 ent->max_renewable_life = default_ent->max_renewable_life;
381
382 if (default_ent
383 && (default_mask & KADM5_PRINC_EXPIRE_TIME)
384 && !(*mask & KADM5_PRINC_EXPIRE_TIME))
385 ent->princ_expire_time = default_ent->princ_expire_time;
386
387 if (default_ent
388 && (default_mask & KADM5_PW_EXPIRATION)
389 && !(*mask & KADM5_PW_EXPIRATION))
390 ent->pw_expiration = default_ent->pw_expiration;
391
392 if (default_ent
393 && (default_mask & KADM5_ATTRIBUTES)
394 && !(*mask & KADM5_ATTRIBUTES))
395 ent->attributes = default_ent->attributes & ~KRB5_KDB_DISALLOW_ALL_TIX;
396 }
397
398 int
edit_entry(kadm5_principal_ent_t ent,int * mask,kadm5_principal_ent_t default_ent,int default_mask)399 edit_entry(kadm5_principal_ent_t ent, int *mask,
400 kadm5_principal_ent_t default_ent, int default_mask)
401 {
402
403 set_defaults(ent, mask, default_ent, default_mask);
404
405 if(edit_deltat ("Max ticket life", &ent->max_life, mask,
406 KADM5_MAX_LIFE) != 0)
407 return 1;
408
409 if(edit_deltat ("Max renewable life", &ent->max_renewable_life, mask,
410 KADM5_MAX_RLIFE) != 0)
411 return 1;
412
413 if(edit_timet ("Principal expiration time", &ent->princ_expire_time, mask,
414 KADM5_PRINC_EXPIRE_TIME) != 0)
415 return 1;
416
417 if(edit_timet ("Password expiration time", &ent->pw_expiration, mask,
418 KADM5_PW_EXPIRATION) != 0)
419 return 1;
420
421 if(edit_attributes ("Attributes", &ent->attributes, mask,
422 KADM5_ATTRIBUTES) != 0)
423 return 1;
424
425 return 0;
426 }
427
428 /*
429 * Parse the arguments, set the fields in `ent' and the `mask' for the
430 * entries having been set.
431 * Return 1 on failure and 0 on success.
432 */
433
434 int
set_entry(krb5_context contextp,kadm5_principal_ent_t ent,int * mask,const char * max_ticket_life,const char * max_renewable_life,const char * expiration,const char * pw_expiration,const char * attributes)435 set_entry(krb5_context contextp,
436 kadm5_principal_ent_t ent,
437 int *mask,
438 const char *max_ticket_life,
439 const char *max_renewable_life,
440 const char *expiration,
441 const char *pw_expiration,
442 const char *attributes)
443 {
444 if (max_ticket_life != NULL) {
445 if (parse_deltat (max_ticket_life, &ent->max_life,
446 mask, KADM5_MAX_LIFE)) {
447 krb5_warnx (contextp, "unable to parse `%s'", max_ticket_life);
448 return 1;
449 }
450 }
451 if (max_renewable_life != NULL) {
452 if (parse_deltat (max_renewable_life, &ent->max_renewable_life,
453 mask, KADM5_MAX_RLIFE)) {
454 krb5_warnx (contextp, "unable to parse `%s'", max_renewable_life);
455 return 1;
456 }
457 }
458
459 if (expiration) {
460 if (parse_timet (expiration, &ent->princ_expire_time,
461 mask, KADM5_PRINC_EXPIRE_TIME)) {
462 krb5_warnx (contextp, "unable to parse `%s'", expiration);
463 return 1;
464 }
465 }
466 if (pw_expiration) {
467 if (parse_timet (pw_expiration, &ent->pw_expiration,
468 mask, KADM5_PW_EXPIRATION)) {
469 krb5_warnx (contextp, "unable to parse `%s'", pw_expiration);
470 return 1;
471 }
472 }
473 if (attributes != NULL) {
474 if (parse_attributes (attributes, &ent->attributes,
475 mask, KADM5_ATTRIBUTES)) {
476 krb5_warnx (contextp, "unable to parse `%s'", attributes);
477 return 1;
478 }
479 }
480 return 0;
481 }
482
483 /*
484 * Does `string' contain any globing characters?
485 */
486
487 static int
is_expression(const char * string)488 is_expression(const char *string)
489 {
490 const char *p;
491 int quote = 0;
492
493 for(p = string; *p; p++) {
494 if(quote) {
495 quote = 0;
496 continue;
497 }
498 if(*p == '\\')
499 quote++;
500 else if(strchr("[]*?", *p) != NULL)
501 return 1;
502 }
503 return 0;
504 }
505
506 /*
507 * Loop over all principals matching exp. If any of calls to `func'
508 * failes, the first error is returned when all principals are
509 * processed.
510 */
511 int
foreach_principal(const char * exp_str,int (* func)(krb5_principal,void *),const char * funcname,void * data)512 foreach_principal(const char *exp_str,
513 int (*func)(krb5_principal, void*),
514 const char *funcname,
515 void *data)
516 {
517 char **princs = NULL;
518 int num_princs = 0;
519 int i;
520 krb5_error_code saved_ret = 0, ret = 0;
521 krb5_principal princ_ent;
522 int is_expr;
523
524 /* if this isn't an expression, there is no point in wading
525 through the whole database looking for matches */
526 is_expr = is_expression(exp_str);
527 if(is_expr)
528 ret = kadm5_get_principals(kadm_handle, exp_str, &princs, &num_princs);
529 if(!is_expr || ret == KADM5_AUTH_LIST) {
530 /* we might be able to perform the requested opreration even
531 if we're not allowed to list principals */
532 num_princs = 1;
533 princs = malloc(sizeof(*princs));
534 if(princs == NULL)
535 return ENOMEM;
536 princs[0] = strdup(exp_str);
537 if(princs[0] == NULL){
538 free(princs);
539 return ENOMEM;
540 }
541 } else if(ret) {
542 krb5_warn(context, ret, "kadm5_get_principals");
543 return ret;
544 }
545 for(i = 0; i < num_princs; i++) {
546 ret = krb5_parse_name(context, princs[i], &princ_ent);
547 if(ret){
548 krb5_warn(context, ret, "krb5_parse_name(%s)", princs[i]);
549 continue;
550 }
551 ret = (*func)(princ_ent, data);
552 if(ret) {
553 krb5_clear_error_message(context);
554 krb5_warn(context, ret, "%s %s", funcname, princs[i]);
555 if (saved_ret == 0)
556 saved_ret = ret;
557 }
558 krb5_free_principal(context, princ_ent);
559 }
560 if (ret == 0 && saved_ret != 0)
561 ret = saved_ret;
562 kadm5_free_name_list(kadm_handle, princs, &num_princs);
563 return ret;
564 }
565
566 /*
567 * prompt with `prompt' and default value `def', and store the reply
568 * in `buf, len'
569 */
570
571 #include <setjmp.h>
572
573 static jmp_buf jmpbuf;
574
575 static void
interrupt(int sig)576 interrupt(int sig)
577 {
578 longjmp(jmpbuf, 1);
579 }
580
581 static int
get_response(const char * prompt,const char * def,char * buf,size_t len)582 get_response(const char *prompt, const char *def, char *buf, size_t len)
583 {
584 char *p;
585 void (*osig)(int);
586
587 osig = signal(SIGINT, interrupt);
588 if(setjmp(jmpbuf)) {
589 signal(SIGINT, osig);
590 fprintf(stderr, "\n");
591 return 1;
592 }
593
594 fprintf(stderr, "%s [%s]:", prompt, def);
595 if(fgets(buf, len, stdin) == NULL) {
596 int save_errno = errno;
597 if(ferror(stdin))
598 krb5_err(context, 1, save_errno, "<stdin>");
599 signal(SIGINT, osig);
600 return 1;
601 }
602 p = strchr(buf, '\n');
603 if(p)
604 *p = '\0';
605 if(strcmp(buf, "") == 0)
606 strlcpy(buf, def, len);
607 signal(SIGINT, osig);
608 return 0;
609 }
610
611 /*
612 * return [0, 16) or -1
613 */
614
615 static int
hex2n(char c)616 hex2n (char c)
617 {
618 static char hexdigits[] = "0123456789abcdef";
619 const char *p;
620
621 p = strchr (hexdigits, tolower((unsigned char)c));
622 if (p == NULL)
623 return -1;
624 else
625 return p - hexdigits;
626 }
627
628 /*
629 * convert a key in a readable format into a keyblock.
630 * return 0 iff succesful, otherwise `err' should point to an error message
631 */
632
633 int
parse_des_key(const char * key_string,krb5_key_data * key_data,const char ** error)634 parse_des_key (const char *key_string, krb5_key_data *key_data,
635 const char **error)
636 {
637 const char *p = key_string;
638 unsigned char bits[8];
639 int i;
640
641 if (strlen (key_string) != 16) {
642 *error = "bad length, should be 16 for DES key";
643 return 1;
644 }
645 for (i = 0; i < 8; ++i) {
646 int d1, d2;
647
648 d1 = hex2n(p[2 * i]);
649 d2 = hex2n(p[2 * i + 1]);
650 if (d1 < 0 || d2 < 0) {
651 *error = "non-hex character";
652 return 1;
653 }
654 bits[i] = (d1 << 4) | d2;
655 }
656 for (i = 0; i < 3; ++i) {
657 key_data[i].key_data_ver = 2;
658 key_data[i].key_data_kvno = 0;
659 /* key */
660 key_data[i].key_data_type[0] = ETYPE_DES_CBC_CRC;
661 key_data[i].key_data_length[0] = 8;
662 key_data[i].key_data_contents[0] = malloc(8);
663 if (key_data[i].key_data_contents[0] == NULL) {
664 *error = "malloc";
665 return ENOMEM;
666 }
667 memcpy (key_data[i].key_data_contents[0], bits, 8);
668 /* salt */
669 key_data[i].key_data_type[1] = KRB5_PW_SALT;
670 key_data[i].key_data_length[1] = 0;
671 key_data[i].key_data_contents[1] = NULL;
672 }
673 key_data[0].key_data_type[0] = ETYPE_DES_CBC_MD5;
674 key_data[1].key_data_type[0] = ETYPE_DES_CBC_MD4;
675 return 0;
676 }
677