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