1/* $OpenBSD: conf_def.c,v 1.34 2024/04/09 13:56:30 beck Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/* Part of the code in here was originally in conf.c, which is now removed */
60
61#include <stdio.h>
62#include <string.h>
63
64#include <openssl/buffer.h>
65#include <openssl/conf.h>
66#include <openssl/conf_api.h>
67#include <openssl/err.h>
68#include <openssl/lhash.h>
69#include <openssl/stack.h>
70
71#include "conf_def.h"
72
73#define MAX_CONF_VALUE_LENGTH 65536
74
75static char *eat_ws(CONF *conf, char *p);
76static char *eat_alpha_numeric(CONF *conf, char *p);
77static void clear_comments(CONF *conf, char *p);
78static int str_copy(CONF *conf, char *section, char **to, char *from);
79static char *scan_quote(CONF *conf, char *p);
80static char *scan_dquote(CONF *conf, char *p);
81#define scan_esc(conf,p)	(((IS_EOF((conf),(p)[1]))?((p)+1):((p)+2)))
82
83static CONF *def_create(CONF_METHOD *meth);
84static int def_init_default(CONF *conf);
85static int def_init_WIN32(CONF *conf);
86static int def_destroy(CONF *conf);
87static int def_destroy_data(CONF *conf);
88static int def_load(CONF *conf, const char *name, long *eline);
89static int def_load_bio(CONF *conf, BIO *bp, long *eline);
90static int def_dump(const CONF *conf, BIO *bp);
91static int def_is_number(const CONF *conf, char c);
92static int def_to_int(const CONF *conf, char c);
93
94static CONF_METHOD default_method = {
95	.name = "OpenSSL default",
96	.create = def_create,
97	.init = def_init_default,
98	.destroy = def_destroy,
99	.destroy_data = def_destroy_data,
100	.load_bio = def_load_bio,
101	.dump = def_dump,
102	.is_number = def_is_number,
103	.to_int = def_to_int,
104	.load = def_load
105};
106
107static CONF_METHOD WIN32_method = {
108	"WIN32",
109	def_create,
110	def_init_WIN32,
111	def_destroy,
112	def_destroy_data,
113	def_load_bio,
114	def_dump,
115	def_is_number,
116	def_to_int,
117	def_load
118};
119
120CONF_METHOD *
121NCONF_default(void)
122{
123	return &default_method;
124}
125LCRYPTO_ALIAS(NCONF_default);
126
127CONF_METHOD *
128NCONF_WIN32(void)
129{
130	return &WIN32_method;
131}
132LCRYPTO_ALIAS(NCONF_WIN32);
133
134static CONF *
135def_create(CONF_METHOD *meth)
136{
137	CONF *ret;
138
139	ret = malloc(sizeof(CONF) + sizeof(unsigned short *));
140	if (ret)
141		if (meth->init(ret) == 0) {
142			free(ret);
143			ret = NULL;
144		}
145	return ret;
146}
147
148static int
149def_init_default(CONF *conf)
150{
151	if (conf == NULL)
152		return 0;
153
154	conf->meth = &default_method;
155	conf->meth_data = CONF_type_default;
156	conf->data = NULL;
157
158	return 1;
159}
160
161static int
162def_init_WIN32(CONF *conf)
163{
164	if (conf == NULL)
165		return 0;
166
167	conf->meth = &WIN32_method;
168	conf->meth_data = (void *)CONF_type_win32;
169	conf->data = NULL;
170
171	return 1;
172}
173
174static int
175def_destroy(CONF *conf)
176{
177	if (def_destroy_data(conf)) {
178		free(conf);
179		return 1;
180	}
181	return 0;
182}
183
184static int
185def_destroy_data(CONF *conf)
186{
187	if (conf == NULL)
188		return 0;
189	_CONF_free_data(conf);
190	return 1;
191}
192
193static int
194def_load(CONF *conf, const char *name, long *line)
195{
196	int ret;
197	BIO *in = NULL;
198
199	in = BIO_new_file(name, "rb");
200	if (in == NULL) {
201		if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)
202			CONFerror(CONF_R_NO_SUCH_FILE);
203		else
204			CONFerror(ERR_R_SYS_LIB);
205		return 0;
206	}
207
208	ret = def_load_bio(conf, in, line);
209	BIO_free(in);
210
211	return ret;
212}
213
214static int
215def_load_bio(CONF *conf, BIO *in, long *line)
216{
217/* The macro BUFSIZE conflicts with a system macro in VxWorks */
218#define CONFBUFSIZE	512
219	int bufnum = 0, i, ii;
220	BUF_MEM *buff = NULL;
221	char *s, *p, *end;
222	int again;
223	long eline = 0;
224	CONF_VALUE *v = NULL, *tv;
225	CONF_VALUE *sv = NULL;
226	char *section = NULL, *buf;
227	char *start, *psection, *pname;
228	void *h = (void *)(conf->data);
229
230	if ((buff = BUF_MEM_new()) == NULL) {
231		CONFerror(ERR_R_BUF_LIB);
232		goto err;
233	}
234
235	section = strdup("default");
236	if (section == NULL) {
237		CONFerror(ERR_R_MALLOC_FAILURE);
238		goto err;
239	}
240
241	if (_CONF_new_data(conf) == 0) {
242		CONFerror(ERR_R_MALLOC_FAILURE);
243		goto err;
244	}
245
246	sv = _CONF_new_section(conf, section);
247	if (sv == NULL) {
248		CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
249		goto err;
250	}
251
252	bufnum = 0;
253	again = 0;
254	for (;;) {
255		if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {
256			CONFerror(ERR_R_BUF_LIB);
257			goto err;
258		}
259		p = &(buff->data[bufnum]);
260		*p = '\0';
261		BIO_gets(in, p, CONFBUFSIZE - 1);
262		p[CONFBUFSIZE - 1] = '\0';
263		ii = i = strlen(p);
264		if (i == 0 && !again)
265			break;
266		again = 0;
267		while (i > 0) {
268			if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))
269				break;
270			else
271				i--;
272		}
273		/* we removed some trailing stuff so there is a new
274		 * line on the end. */
275		if (ii && i == ii)
276			again = 1; /* long line */
277		else {
278			p[i] = '\0';
279			eline++; /* another input line */
280		}
281
282		/* we now have a line with trailing \r\n removed */
283
284		/* i is the number of bytes */
285		bufnum += i;
286
287		v = NULL;
288		/* check for line continuation */
289		if (bufnum >= 1) {
290			/* If we have bytes and the last char '\\' and
291			 * second last char is not '\\' */
292			p = &(buff->data[bufnum - 1]);
293			if (IS_ESC(conf, p[0]) &&
294			    ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {
295				bufnum--;
296				again = 1;
297			}
298		}
299		if (again)
300			continue;
301		bufnum = 0;
302		buf = buff->data;
303
304		clear_comments(conf, buf);
305		s = eat_ws(conf, buf);
306		if (IS_EOF(conf, *s))
307			continue; /* blank line */
308		if (*s == '[') {
309			char *ss;
310
311			s++;
312			start = eat_ws(conf, s);
313			ss = start;
314again:
315			end = eat_alpha_numeric(conf, ss);
316			p = eat_ws(conf, end);
317			if (*p != ']') {
318				if (*p != '\0' && ss != p) {
319					ss = p;
320					goto again;
321				}
322				CONFerror(CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
323				goto err;
324			}
325			*end = '\0';
326			if (!str_copy(conf, NULL, &section, start))
327				goto err;
328			if ((sv = _CONF_get_section(conf, section)) == NULL)
329				sv = _CONF_new_section(conf, section);
330			if (sv == NULL) {
331				CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
332				goto err;
333			}
334			continue;
335		} else {
336			pname = s;
337			psection = NULL;
338			end = eat_alpha_numeric(conf, s);
339			if ((end[0] == ':') && (end[1] == ':')) {
340				*end = '\0';
341				end += 2;
342				psection = pname;
343				pname = end;
344				end = eat_alpha_numeric(conf, end);
345			}
346			p = eat_ws(conf, end);
347			if (*p != '=') {
348				CONFerror(CONF_R_MISSING_EQUAL_SIGN);
349				goto err;
350			}
351			*end = '\0';
352			p++;
353			start = eat_ws(conf, p);
354			while (!IS_EOF(conf, *p))
355				p++;
356			p--;
357			while ((p != start) && (IS_WS(conf, *p)))
358				p--;
359			p++;
360			*p = '\0';
361
362			if (!(v = malloc(sizeof(CONF_VALUE)))) {
363				CONFerror(ERR_R_MALLOC_FAILURE);
364				goto err;
365			}
366			if (psection == NULL)
367				psection = section;
368			v->name = strdup(pname);
369			v->value = NULL;
370			if (v->name == NULL) {
371				CONFerror(ERR_R_MALLOC_FAILURE);
372				goto err;
373			}
374			if (!str_copy(conf, psection, &(v->value), start))
375				goto err;
376
377			if (strcmp(psection, section) != 0) {
378				if ((tv = _CONF_get_section(conf, psection))
379					== NULL)
380					tv = _CONF_new_section(conf, psection);
381				if (tv == NULL) {
382					CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
383					goto err;
384				}
385			} else
386				tv = sv;
387
388			if (_CONF_add_string(conf, tv, v) == 0) {
389				CONFerror(ERR_R_MALLOC_FAILURE);
390				goto err;
391			}
392			v = NULL;
393		}
394	}
395	if (buff != NULL)
396		BUF_MEM_free(buff);
397	free(section);
398	return (1);
399
400err:
401	if (buff != NULL)
402		BUF_MEM_free(buff);
403	free(section);
404	if (line != NULL)
405		*line = eline;
406	ERR_asprintf_error_data("line %ld", eline);
407	if ((h != conf->data) && (conf->data != NULL)) {
408		CONF_free(conf->data);
409		conf->data = NULL;
410	}
411	if (v != NULL) {
412		free(v->name);
413		free(v->value);
414		free(v);
415	}
416	return (0);
417}
418
419static void
420clear_comments(CONF *conf, char *p)
421{
422	for (;;) {
423		if (IS_FCOMMENT(conf, *p)) {
424			*p = '\0';
425			return;
426		}
427		if (!IS_WS(conf, *p)) {
428			break;
429		}
430		p++;
431	}
432
433	for (;;) {
434		if (IS_COMMENT(conf, *p)) {
435			*p = '\0';
436			return;
437		}
438		if (IS_DQUOTE(conf, *p)) {
439			p = scan_dquote(conf, p);
440			continue;
441		}
442		if (IS_QUOTE(conf, *p)) {
443			p = scan_quote(conf, p);
444			continue;
445		}
446		if (IS_ESC(conf, *p)) {
447			p = scan_esc(conf, p);
448			continue;
449		}
450		if (IS_EOF(conf, *p))
451			return;
452		else
453			p++;
454	}
455}
456
457static int
458str_copy(CONF *conf, char *section, char **pto, char *from)
459{
460	int q, r,rr = 0, to = 0, len = 0;
461	char *s, *e, *rp, *p, *rrp, *np, *cp, v;
462	size_t newsize;
463	BUF_MEM *buf;
464
465	if ((buf = BUF_MEM_new()) == NULL)
466		return (0);
467
468	len = strlen(from) + 1;
469	if (!BUF_MEM_grow(buf, len))
470		goto err;
471
472	for (;;) {
473		if (IS_QUOTE(conf, *from)) {
474			q = *from;
475			from++;
476			while (!IS_EOF(conf, *from) && (*from != q)) {
477				if (IS_ESC(conf, *from)) {
478					from++;
479					if (IS_EOF(conf, *from))
480						break;
481				}
482				buf->data[to++] = *(from++);
483			}
484			if (*from == q)
485				from++;
486		} else if (IS_DQUOTE(conf, *from)) {
487			q = *from;
488			from++;
489			while (!IS_EOF(conf, *from)) {
490				if (*from == q) {
491					if (*(from + 1) == q) {
492						from++;
493					} else {
494						break;
495					}
496				}
497				buf->data[to++] = *(from++);
498			}
499			if (*from == q)
500				from++;
501		} else if (IS_ESC(conf, *from)) {
502			from++;
503			v = *(from++);
504			if (IS_EOF(conf, v))
505				break;
506			else if (v == 'r')
507				v = '\r';
508			else if (v == 'n')
509				v = '\n';
510			else if (v == 'b')
511				v = '\b';
512			else if (v == 't')
513				v = '\t';
514			buf->data[to++] = v;
515		} else if (IS_EOF(conf, *from))
516			break;
517		else if (*from == '$') {
518			/* try to expand it */
519			rrp = NULL;
520			s = &(from[1]);
521			if (*s == '{')
522				q = '}';
523			else if (*s == '(')
524				q = ')';
525			else
526				q = 0;
527
528			if (q)
529				s++;
530			cp = section;
531			e = np = s;
532			while (IS_ALPHA_NUMERIC(conf, *e))
533				e++;
534			if ((e[0] == ':') && (e[1] == ':')) {
535				cp = np;
536				rrp = e;
537				rr = *e;
538				*rrp = '\0';
539				e += 2;
540				np = e;
541				while (IS_ALPHA_NUMERIC(conf, *e))
542					e++;
543			}
544			r = *e;
545			*e = '\0';
546			rp = e;
547			if (q) {
548				if (r != q) {
549					CONFerror(CONF_R_NO_CLOSE_BRACE);
550					goto err;
551				}
552				e++;
553			}
554			/* So at this point we have
555			 * np which is the start of the name string which is
556			 *   '\0' terminated.
557			 * cp which is the start of the section string which is
558			 *   '\0' terminated.
559			 * e is the 'next point after'.
560			 * r and rr are the chars replaced by the '\0'
561			 * rp and rrp is where 'r' and 'rr' came from.
562			 */
563			p = _CONF_get_string(conf, cp, np);
564			if (rrp != NULL)
565				*rrp = rr;
566			*rp = r;
567			if (p == NULL) {
568				CONFerror(CONF_R_VARIABLE_HAS_NO_VALUE);
569				goto err;
570			}
571			newsize = strlen(p) + buf->length - (e - from);
572			if (newsize > MAX_CONF_VALUE_LENGTH) {
573				CONFerror(CONF_R_VARIABLE_EXPANSION_TOO_LONG);
574				goto err;
575			}
576			if (!BUF_MEM_grow_clean(buf, newsize)) {
577				CONFerror(CONF_R_MODULE_INITIALIZATION_ERROR);
578				goto err;
579			}
580			while (*p)
581				buf->data[to++] = *(p++);
582
583			/* Since we change the pointer 'from', we also have
584			   to change the perceived length of the string it
585			   points at.  /RL */
586			len -= e - from;
587			from = e;
588
589			/* In case there were no braces or parenthesis around
590			   the variable reference, we have to put back the
591			   character that was replaced with a '\0'.  /RL */
592			*rp = r;
593		} else
594			buf->data[to++] = *(from++);
595	}
596	buf->data[to]='\0';
597	free(*pto);
598	*pto = buf->data;
599	free(buf);
600	return (1);
601
602err:
603	if (buf != NULL)
604		BUF_MEM_free(buf);
605	return (0);
606}
607
608static char *
609eat_ws(CONF *conf, char *p)
610{
611	while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
612		p++;
613	return (p);
614}
615
616static char *
617eat_alpha_numeric(CONF *conf, char *p)
618{
619	for (;;) {
620		if (IS_ESC(conf, *p)) {
621			p = scan_esc(conf, p);
622			continue;
623		}
624		if (!IS_ALPHA_NUMERIC_PUNCT(conf, *p))
625			return (p);
626		p++;
627	}
628}
629
630static char *
631scan_quote(CONF *conf, char *p)
632{
633	int q = *p;
634
635	p++;
636	while (!(IS_EOF(conf, *p)) && (*p != q)) {
637		if (IS_ESC(conf, *p)) {
638			p++;
639			if (IS_EOF(conf, *p))
640				return (p);
641		}
642		p++;
643	}
644	if (*p == q)
645		p++;
646	return (p);
647}
648
649
650static char *
651scan_dquote(CONF *conf, char *p)
652{
653	int q = *p;
654
655	p++;
656	while (!(IS_EOF(conf, *p))) {
657		if (*p == q) {
658			if (*(p + 1) == q) {
659				p++;
660			} else {
661				break;
662			}
663		}
664		p++;
665	}
666	if (*p == q)
667		p++;
668	return (p);
669}
670
671static void
672dump_value_doall_arg(CONF_VALUE *a, BIO *out)
673{
674	if (a->name)
675		BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
676	else
677		BIO_printf(out, "[[%s]]\n", a->section);
678}
679
680static IMPLEMENT_LHASH_DOALL_ARG_FN(dump_value, CONF_VALUE, BIO)
681
682static int
683def_dump(const CONF *conf, BIO *out)
684{
685	lh_CONF_VALUE_doall_arg(conf->data, LHASH_DOALL_ARG_FN(dump_value),
686	    BIO, out);
687	return 1;
688}
689
690static int
691def_is_number(const CONF *conf, char c)
692{
693	return IS_NUMBER(conf, c);
694}
695
696static int
697def_to_int(const CONF *conf, char c)
698{
699	return c - '0';
700}
701