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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/smtpd/smtpd/../mda_variables.c	Lines:	0	158	0.0 %
Date:	2017-11-13	Branches:	0	142	0.0 %


/*	$OpenBSD: mda_variables.c,v 1.1 2017/05/26 21:30:00 gilles Exp $	*/

/*
 * Copyright (c) 2011-2017 Gilles Chehade <gilles@poolp.org>
 * Copyright (c) 2012 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 <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <imsg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>

#include "smtpd.h"
#include "log.h"

#define	EXPAND_DEPTH	10

size_t mda_expand_format(char *, size_t, const struct envelope *,
    const struct userinfo *);
static size_t mda_expand_token(char *, size_t, const char *,
    const struct envelope *, const struct userinfo *);
static int mod_lowercase(char *, size_t);
static int mod_uppercase(char *, size_t);
static int mod_strip(char *, size_t);

static struct modifiers {
	char	*name;
	int	(*f)(char *buf, size_t len);
} token_modifiers[] = {
	{ "lowercase",	mod_lowercase },
	{ "uppercase",	mod_uppercase },
	{ "strip",	mod_strip },
	{ "raw",	NULL },		/* special case, must stay last */
};

#define	MAXTOKENLEN	128

static size_t
mda_expand_token(char *dest, size_t len, const char *token,
    const struct envelope *ep, const struct userinfo *ui)
{
	char		rtoken[MAXTOKENLEN];
	char		tmp[EXPAND_BUFFER];
	const char     *string;
	char	       *lbracket, *rbracket, *content, *sep, *mods;
	ssize_t		i;
	ssize_t		begoff, endoff;
	const char     *errstr = NULL;
	int		replace = 1;
	int		raw = 0;

	begoff = 0;
	endoff = EXPAND_BUFFER;
	mods = NULL;

	if (strlcpy(rtoken, token, sizeof rtoken) >= sizeof rtoken)
		return 0;

	/* token[x[:y]] -> extracts optional x and y, converts into offsets */
	if ((lbracket = strchr(rtoken, '[')) &&
	    (rbracket = strchr(rtoken, ']'))) {
		/* ] before [ ... or empty */
		if (rbracket < lbracket || rbracket - lbracket <= 1)
			return 0;

		*lbracket = *rbracket = '\0';
		 content  = lbracket + 1;

		 if ((sep = strchr(content, ':')) == NULL)
			 endoff = begoff = strtonum(content, -EXPAND_BUFFER,
			     EXPAND_BUFFER, &errstr);
		 else {
			 *sep = '\0';
			 if (content != sep)
				 begoff = strtonum(content, -EXPAND_BUFFER,
				     EXPAND_BUFFER, &errstr);
			 if (*(++sep)) {
				 if (errstr == NULL)
					 endoff = strtonum(sep, -EXPAND_BUFFER,
					     EXPAND_BUFFER, &errstr);
			 }
		 }
		 if (errstr)
			 return 0;

		 /* token:mod_1,mod_2,mod_n -> extract modifiers */
		 mods = strchr(rbracket + 1, ':');
	} else {
		if ((mods = strchr(rtoken, ':')) != NULL)
			*mods++ = '\0';
	}

	/* token -> expanded token */
	if (!strcasecmp("sender", rtoken)) {
		if (snprintf(tmp, sizeof tmp, "%s@%s",
			ep->sender.user, ep->sender.domain) >= (int)sizeof tmp)
			return 0;
		string = tmp;
	}
	else if (!strcasecmp("dest", rtoken)) {
		if (snprintf(tmp, sizeof tmp, "%s@%s",
			ep->dest.user, ep->dest.domain) >= (int)sizeof tmp)
			return 0;
		string = tmp;
	}
	else if (!strcasecmp("rcpt", rtoken)) {
		if (snprintf(tmp, sizeof tmp, "%s@%s",
			ep->rcpt.user, ep->rcpt.domain) >= (int)sizeof tmp)
			return 0;
		string = tmp;
	}
	else if (!strcasecmp("sender.user", rtoken))
		string = ep->sender.user;
	else if (!strcasecmp("sender.domain", rtoken))
		string = ep->sender.domain;
	else if (!strcasecmp("user.username", rtoken))
		string = ui->username;
	else if (!strcasecmp("user.directory", rtoken)) {
		string = ui->directory;
		replace = 0;
	}
	else if (!strcasecmp("dest.user", rtoken))
		string = ep->dest.user;
	else if (!strcasecmp("dest.domain", rtoken))
		string = ep->dest.domain;
	else if (!strcasecmp("rcpt.user", rtoken))
		string = ep->rcpt.user;
	else if (!strcasecmp("rcpt.domain", rtoken))
		string = ep->rcpt.domain;
	else
		return 0;

	if (string != tmp) {
		if (strlcpy(tmp, string, sizeof tmp) >= sizeof tmp)
			return 0;
		string = tmp;
	}

	/*  apply modifiers */
	if (mods != NULL) {
		do {
			if ((sep = strchr(mods, '|')) != NULL)
				*sep++ = '\0';
			for (i = 0; (size_t)i < nitems(token_modifiers); ++i) {
				if (!strcasecmp(token_modifiers[i].name, mods)) {
					if (token_modifiers[i].f == NULL) {
						raw = 1;
						break;
					}
					if (!token_modifiers[i].f(tmp, sizeof tmp))
						return 0; /* modifier error */
					break;
				}
			}
			if ((size_t)i == nitems(token_modifiers))
				return 0; /* modifier not found */
		} while ((mods = sep) != NULL);
	}

	if (!raw && replace)
		for (i = 0; (size_t)i < strlen(tmp); ++i)
			if (strchr(MAILADDR_ESCAPE, tmp[i]))
				tmp[i] = ':';

	/* expanded string is empty */
	i = strlen(string);
	if (i == 0)
		return 0;

	/* begin offset beyond end of string */
	if (begoff >= i)
		return 0;

	/* end offset beyond end of string, make it end of string */
	if (endoff >= i)
		endoff = i - 1;

	/* negative begin offset, make it relative to end of string */
	if (begoff < 0)
		begoff += i;
	/* negative end offset, make it relative to end of string,
	 * note that end offset is inclusive.
	 */
	if (endoff < 0)
		endoff += i - 1;

	/* check that final offsets are valid */
	if (begoff < 0 || endoff < 0 || endoff < begoff)
		return 0;
	endoff += 1; /* end offset is inclusive */

	/* check that substring does not exceed destination buffer length */
	i = endoff - begoff;
	if ((size_t)i + 1 >= len)
		return 0;

	string += begoff;
	for (; i; i--) {
		*dest = (replace && *string == '/') ? ':' : *string;
		dest++;
		string++;
	}

	return endoff - begoff;
}


size_t
mda_expand_format(char *buf, size_t len, const struct envelope *ep,
    const struct userinfo *ui)
{
	char		tmpbuf[EXPAND_BUFFER], *ptmp, *pbuf, *ebuf;
	char		exptok[EXPAND_BUFFER];
	size_t		exptoklen;
	char		token[MAXTOKENLEN];
	size_t		ret, tmpret;

	if (len < sizeof tmpbuf) {
		log_warnx("mda_expand_format: tmp buffer < rule buffer");
		return 0;
	}

	memset(tmpbuf, 0, sizeof tmpbuf);
	pbuf = buf;
	ptmp = tmpbuf;
	ret = tmpret = 0;

	/* special case: ~/ only allowed expanded at the beginning */
	if (strncmp(pbuf, "~/", 2) == 0) {
		tmpret = snprintf(ptmp, sizeof tmpbuf, "%s/", ui->directory);
		if (tmpret >= sizeof tmpbuf) {
			log_warnx("warn: user directory for %s too large",
			    ui->directory);
			return 0;
		}
		ret  += tmpret;
		ptmp += tmpret;
		pbuf += 2;
	}


	/* expansion loop */
	for (; *pbuf && ret < sizeof tmpbuf; ret += tmpret) {
		if (*pbuf == '%' && *(pbuf + 1) == '%') {
			*ptmp++ = *pbuf++;
			pbuf  += 1;
			tmpret = 1;
			continue;
		}

		if (*pbuf != '%' || *(pbuf + 1) != '{') {
			*ptmp++ = *pbuf++;
			tmpret = 1;
			continue;
		}

		/* %{...} otherwise fail */
		if (*(pbuf+1) != '{' || (ebuf = strchr(pbuf+1, '}')) == NULL)
			return 0;

		/* extract token from %{token} */
		if ((size_t)(ebuf - pbuf) - 1 >= sizeof token)
			return 0;

		memcpy(token, pbuf+2, ebuf-pbuf-1);
		if (strchr(token, '}') == NULL)
			return 0;
		*strchr(token, '}') = '\0';

		exptoklen = mda_expand_token(exptok, sizeof exptok, token, ep,
		    ui);
		if (exptoklen == 0)
			return 0;

		/* writing expanded token at ptmp will overflow tmpbuf */
		if (sizeof (tmpbuf) - (ptmp - tmpbuf) <= exptoklen)
			return 0;

		memcpy(ptmp, exptok, exptoklen);
		pbuf   = ebuf + 1;
		ptmp  += exptoklen;
		tmpret = exptoklen;
	}
	if (ret >= sizeof tmpbuf)
		return 0;

	if ((ret = strlcpy(buf, tmpbuf, len)) >= len)
		return 0;

	return ret;
}

static int
mod_lowercase(char *buf, size_t len)
{
	char tmp[EXPAND_BUFFER];

	if (!lowercase(tmp, buf, sizeof tmp))
		return 0;
	if (strlcpy(buf, tmp, len) >= len)
		return 0;
	return 1;
}

static int
mod_uppercase(char *buf, size_t len)
{
	char tmp[EXPAND_BUFFER];

	if (!uppercase(tmp, buf, sizeof tmp))
		return 0;
	if (strlcpy(buf, tmp, len) >= len)
		return 0;
	return 1;
}

static int
mod_strip(char *buf, size_t len)
{
	char *tag, *at;
	unsigned int i;

	/* gilles+hackers -> gilles */
	if ((tag = strchr(buf, *env->sc_subaddressing_delim)) != NULL) {
		/* gilles+hackers@poolp.org -> gilles@poolp.org */
		if ((at = strchr(tag, '@')) != NULL) {
			for (i = 0; i <= strlen(at); ++i)
				tag[i] = at[i];
		} else
			*tag = '\0';
	}
	return 1;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: mda_variables.c,v 1.1 2017/05/26 21:30:00 gilles Exp $ */
2
3			/*
4			* Copyright (c) 2011-2017 Gilles Chehade <gilles@poolp.org>
5			* Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
6			*
7			* Permission to use, copy, modify, and distribute this software for any
8			* purpose with or without fee is hereby granted, provided that the above
9			* copyright notice and this permission notice appear in all copies.
10			*
11			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18			*/
19
20			#include <sys/types.h>
21			#include <sys/queue.h>
22			#include <sys/tree.h>
23			#include <sys/socket.h>
24
25			#include <netinet/in.h>
26
27			#include <imsg.h>
28			#include <stdio.h>
29			#include <stdlib.h>
30			#include <string.h>
31			#include <unistd.h>
32			#include <limits.h>
33
34			#include "smtpd.h"
35			#include "log.h"
36
37			#define EXPAND_DEPTH 10
38
39			size_t mda_expand_format(char , size_t, const struct envelope ,
40			const struct userinfo *);
41			static size_t mda_expand_token(char , size_t, const char ,
42			const struct envelope , const struct userinfo );
43			static int mod_lowercase(char *, size_t);
44			static int mod_uppercase(char *, size_t);
45			static int mod_strip(char *, size_t);
46
47			static struct modifiers {
48			char *name;
49			int (f)(char buf, size_t len);
50			} token_modifiers[] = {
51			{ "lowercase", mod_lowercase },
52			{ "uppercase", mod_uppercase },
53			{ "strip", mod_strip },
54			{ "raw", NULL }, /* special case, must stay last */
55			};
56
57			#define MAXTOKENLEN 128
58
59			static size_t
60			mda_expand_token(char dest, size_t len, const char token,
61			const struct envelope ep, const struct userinfo ui)
62			{
63			char rtoken[MAXTOKENLEN];
64			char tmp[EXPAND_BUFFER];
65			const char *string;
66			char lbracket, rbracket, content, sep, *mods;
67			ssize_t i;
68			ssize_t begoff, endoff;
69			const char *errstr = NULL;
70			int replace = 1;
71			int raw = 0;
72
73			begoff = 0;
74			endoff = EXPAND_BUFFER;
75			mods = NULL;
76
77			if (strlcpy(rtoken, token, sizeof rtoken) >= sizeof rtoken)
78			return 0;
79
80			/* token[x[:y]] -> extracts optional x and y, converts into offsets */
81			if ((lbracket = strchr(rtoken, '[')) &&
82			(rbracket = strchr(rtoken, ']'))) {
83			/* ] before [ ... or empty */
84			if (rbracket < lbracket \|\| rbracket - lbracket <= 1)
85			return 0;
86
87			lbracket = rbracket = '\0';
88			content = lbracket + 1;
89
90			if ((sep = strchr(content, ':')) == NULL)
91			endoff = begoff = strtonum(content, -EXPAND_BUFFER,
92			EXPAND_BUFFER, &errstr);
93			else {
94			*sep = '\0';
95			if (content != sep)
96			begoff = strtonum(content, -EXPAND_BUFFER,
97			EXPAND_BUFFER, &errstr);
98			if (*(++sep)) {
99			if (errstr == NULL)
100			endoff = strtonum(sep, -EXPAND_BUFFER,
101			EXPAND_BUFFER, &errstr);
102			}
103			}
104			if (errstr)
105			return 0;
106
107			/* token:mod_1,mod_2,mod_n -> extract modifiers */
108			mods = strchr(rbracket + 1, ':');
109			} else {
110			if ((mods = strchr(rtoken, ':')) != NULL)
111			*mods++ = '\0';
112			}
113
114			/* token -> expanded token */
115			if (!strcasecmp("sender", rtoken)) {
116			if (snprintf(tmp, sizeof tmp, "%s@%s",
117			ep->sender.user, ep->sender.domain) >= (int)sizeof tmp)
118			return 0;
119			string = tmp;
120			}
121			else if (!strcasecmp("dest", rtoken)) {
122			if (snprintf(tmp, sizeof tmp, "%s@%s",
123			ep->dest.user, ep->dest.domain) >= (int)sizeof tmp)
124			return 0;
125			string = tmp;
126			}
127			else if (!strcasecmp("rcpt", rtoken)) {
128			if (snprintf(tmp, sizeof tmp, "%s@%s",
129			ep->rcpt.user, ep->rcpt.domain) >= (int)sizeof tmp)
130			return 0;
131			string = tmp;
132			}
133			else if (!strcasecmp("sender.user", rtoken))
134			string = ep->sender.user;
135			else if (!strcasecmp("sender.domain", rtoken))
136			string = ep->sender.domain;
137			else if (!strcasecmp("user.username", rtoken))
138			string = ui->username;
139			else if (!strcasecmp("user.directory", rtoken)) {
140			string = ui->directory;
141			replace = 0;
142			}
143			else if (!strcasecmp("dest.user", rtoken))
144			string = ep->dest.user;
145			else if (!strcasecmp("dest.domain", rtoken))
146			string = ep->dest.domain;
147			else if (!strcasecmp("rcpt.user", rtoken))
148			string = ep->rcpt.user;
149			else if (!strcasecmp("rcpt.domain", rtoken))
150			string = ep->rcpt.domain;
151			else
152			return 0;
153
154			if (string != tmp) {
155			if (strlcpy(tmp, string, sizeof tmp) >= sizeof tmp)
156			return 0;
157			string = tmp;
158			}
159
160			/* apply modifiers */
161			if (mods != NULL) {
162			do {
163			if ((sep = strchr(mods, '\|')) != NULL)
164			*sep++ = '\0';
165			for (i = 0; (size_t)i < nitems(token_modifiers); ++i) {
166			if (!strcasecmp(token_modifiers[i].name, mods)) {
167			if (token_modifiers[i].f == NULL) {
168			raw = 1;
169			break;
170			}
171			if (!token_modifiers[i].f(tmp, sizeof tmp))
172			return 0; /* modifier error */
173			break;
174			}
175			}
176			if ((size_t)i == nitems(token_modifiers))
177			return 0; /* modifier not found */
178			} while ((mods = sep) != NULL);
179			}
180
181			if (!raw && replace)
182			for (i = 0; (size_t)i < strlen(tmp); ++i)
183			if (strchr(MAILADDR_ESCAPE, tmp[i]))
184			tmp[i] = ':';
185
186			/* expanded string is empty */
187			i = strlen(string);
188			if (i == 0)
189			return 0;
190
191			/* begin offset beyond end of string */
192			if (begoff >= i)
193			return 0;
194
195			/* end offset beyond end of string, make it end of string */
196			if (endoff >= i)
197			endoff = i - 1;
198
199			/* negative begin offset, make it relative to end of string */
200			if (begoff < 0)
201			begoff += i;
202			/* negative end offset, make it relative to end of string,
203			* note that end offset is inclusive.
204			*/
205			if (endoff < 0)
206			endoff += i - 1;
207
208			/* check that final offsets are valid */
209			if (begoff < 0 \|\| endoff < 0 \|\| endoff < begoff)
210			return 0;
211			endoff += 1; /* end offset is inclusive */
212
213			/* check that substring does not exceed destination buffer length */
214			i = endoff - begoff;
215			if ((size_t)i + 1 >= len)
216			return 0;
217
218			string += begoff;
219			for (; i; i--) {
220			dest = (replace && string == '/') ? ':' : *string;
221			dest++;
222			string++;
223			}
224
225			return endoff - begoff;
226			}
227
228
229			size_t
230			mda_expand_format(char buf, size_t len, const struct envelope ep,
231			const struct userinfo *ui)
232			{
233			char tmpbuf[EXPAND_BUFFER], ptmp, pbuf, *ebuf;
234			char exptok[EXPAND_BUFFER];
235			size_t exptoklen;
236			char token[MAXTOKENLEN];
237			size_t ret, tmpret;
238
239			if (len < sizeof tmpbuf) {
240			log_warnx("mda_expand_format: tmp buffer < rule buffer");
241			return 0;
242			}
243
244			memset(tmpbuf, 0, sizeof tmpbuf);
245			pbuf = buf;
246			ptmp = tmpbuf;
247			ret = tmpret = 0;
248
249			/* special case: ~/ only allowed expanded at the beginning */
250			if (strncmp(pbuf, "~/", 2) == 0) {
251			tmpret = snprintf(ptmp, sizeof tmpbuf, "%s/", ui->directory);
252			if (tmpret >= sizeof tmpbuf) {
253			log_warnx("warn: user directory for %s too large",
254			ui->directory);
255			return 0;
256			}
257			ret += tmpret;
258			ptmp += tmpret;
259			pbuf += 2;
260			}
261
262
263			/* expansion loop */
264			for (; *pbuf && ret < sizeof tmpbuf; ret += tmpret) {
265			if (pbuf == '%' && (pbuf + 1) == '%') {
266			ptmp++ = pbuf++;
267			pbuf += 1;
268			tmpret = 1;
269			continue;
270			}
271
272			if (pbuf != '%' \|\| (pbuf + 1) != '{') {
273			ptmp++ = pbuf++;
274			tmpret = 1;
275			continue;
276			}
277
278			/* %{...} otherwise fail */
279			if (*(pbuf+1) != '{' \|\| (ebuf = strchr(pbuf+1, '}')) == NULL)
280			return 0;
281
282			/* extract token from %{token} */
283			if ((size_t)(ebuf - pbuf) - 1 >= sizeof token)
284			return 0;
285
286			memcpy(token, pbuf+2, ebuf-pbuf-1);
287			if (strchr(token, '}') == NULL)
288			return 0;
289			*strchr(token, '}') = '\0';
290
291			exptoklen = mda_expand_token(exptok, sizeof exptok, token, ep,
292			ui);
293			if (exptoklen == 0)
294			return 0;
295
296			/* writing expanded token at ptmp will overflow tmpbuf */
297			if (sizeof (tmpbuf) - (ptmp - tmpbuf) <= exptoklen)
298			return 0;
299
300			memcpy(ptmp, exptok, exptoklen);
301			pbuf = ebuf + 1;
302			ptmp += exptoklen;
303			tmpret = exptoklen;
304			}
305			if (ret >= sizeof tmpbuf)
306			return 0;
307
308			if ((ret = strlcpy(buf, tmpbuf, len)) >= len)
309			return 0;
310
311			return ret;
312			}
313
314			static int
315			mod_lowercase(char *buf, size_t len)
316			{
317			char tmp[EXPAND_BUFFER];
318
319			if (!lowercase(tmp, buf, sizeof tmp))
320			return 0;
321			if (strlcpy(buf, tmp, len) >= len)
322			return 0;
323			return 1;
324			}
325
326			static int
327			mod_uppercase(char *buf, size_t len)
328			{
329			char tmp[EXPAND_BUFFER];
330
331			if (!uppercase(tmp, buf, sizeof tmp))
332			return 0;
333			if (strlcpy(buf, tmp, len) >= len)
334			return 0;
335			return 1;
336			}
337
338			static int
339			mod_strip(char *buf, size_t len)
340			{
341			char tag, at;
342			unsigned int i;
343
344			/* gilles+hackers -> gilles */
345			if ((tag = strchr(buf, *env->sc_subaddressing_delim)) != NULL) {
346			/* gilles+hackers@poolp.org -> gilles@poolp.org */
347			if ((at = strchr(tag, '@')) != NULL) {
348			for (i = 0; i <= strlen(at); ++i)
349			tag[i] = at[i];
350			} else
351			*tag = '\0';
352			}
353			return 1;
354			}