1/*	$NetBSD: ruserpass.c,v 1.8 2007/08/06 04:33:24 lukem Exp $	*/
2/*	from	NetBSD: ruserpass.c,v 1.33 2007/04/17 05:52:04 lukem Exp	*/
3
4/*
5 * Copyright (c) 1985, 1993, 1994
6 *	The Regents of the University of California.  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 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
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 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include "tnftp.h"
34
35#if 0	/* tnftp */
36
37#include <sys/cdefs.h>
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)ruserpass.c	8.4 (Berkeley) 4/27/95";
41#else
42__RCSID(" NetBSD: ruserpass.c,v 1.33 2007/04/17 05:52:04 lukem Exp  ");
43#endif
44#endif /* not lint */
45
46#include <sys/types.h>
47#include <sys/stat.h>
48
49#include <ctype.h>
50#include <err.h>
51#include <errno.h>
52#include <netdb.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <unistd.h>
57
58#endif	/* tnftp */
59
60#include "ftp_var.h"
61
62static	int token(void);
63static	FILE *cfile;
64
65#define	DEFAULT	1
66#define	LOGIN	2
67#define	PASSWD	3
68#define	ACCOUNT	4
69#define	MACDEF	5
70#define	ID	10
71#define	MACH	11
72
73static char tokval[100];
74
75static struct toktab {
76	const char *tokstr;
77	int tval;
78} toktab[] = {
79	{ "default",	DEFAULT },
80	{ "login",	LOGIN },
81	{ "password",	PASSWD },
82	{ "passwd",	PASSWD },
83	{ "account",	ACCOUNT },
84	{ "machine",	MACH },
85	{ "macdef",	MACDEF },
86	{ NULL,		0 }
87};
88
89int
90ruserpass(const char *host, char **aname, char **apass, char **aacct)
91{
92	char *tmp;
93	const char *mydomain;
94	char myname[MAXHOSTNAMELEN + 1];
95	int t, i, c, usedefault = 0;
96	struct stat stb;
97
98	if (netrc[0] == '\0')
99		return (0);
100	cfile = fopen(netrc, "r");
101	if (cfile == NULL) {
102		if (errno != ENOENT)
103			warn("Can't read `%s'", netrc);
104		return (0);
105	}
106	if (gethostname(myname, sizeof(myname)) < 0)
107		myname[0] = '\0';
108	myname[sizeof(myname) - 1] = '\0';
109	if ((mydomain = strchr(myname, '.')) == NULL)
110		mydomain = "";
111 next:
112	while ((t = token()) > 0) switch(t) {
113
114	case DEFAULT:
115		usedefault = 1;
116		/* FALL THROUGH */
117
118	case MACH:
119		if (!usedefault) {
120			if ((t = token()) == -1)
121				goto bad;
122			if (t != ID)
123				continue;
124			/*
125			 * Allow match either for user's input host name
126			 * or official hostname.  Also allow match of
127			 * incompletely-specified host in local domain.
128			 */
129			if (strcasecmp(host, tokval) == 0)
130				goto match;
131			if (strcasecmp(hostname, tokval) == 0)
132				goto match;
133			if ((tmp = strchr(hostname, '.')) != NULL &&
134			    strcasecmp(tmp, mydomain) == 0 &&
135			    strncasecmp(hostname, tokval, tmp-hostname) == 0 &&
136			    tokval[tmp - hostname] == '\0')
137				goto match;
138			if ((tmp = strchr(host, '.')) != NULL &&
139			    strcasecmp(tmp, mydomain) == 0 &&
140			    strncasecmp(host, tokval, tmp - host) == 0 &&
141			    tokval[tmp - host] == '\0')
142				goto match;
143			continue;
144		}
145	match:
146		while ((t = token()) > 0 &&
147		    t != MACH && t != DEFAULT) switch(t) {
148
149		case LOGIN:
150			if ((t = token()) == -1)
151				goto bad;
152			if (t) {
153				if (*aname == NULL)
154					*aname = ftp_strdup(tokval);
155				else {
156					if (strcmp(*aname, tokval))
157						goto next;
158				}
159			}
160			break;
161		case PASSWD:
162			if ((*aname == NULL || strcmp(*aname, "anonymous")) &&
163			    fstat(fileno(cfile), &stb) >= 0 &&
164			    (stb.st_mode & 077) != 0) {
165	warnx("Error: .netrc file is readable by others");
166	warnx("Remove password or make file unreadable by others");
167				goto bad;
168			}
169			if ((t = token()) == -1)
170				goto bad;
171			if (t && *apass == NULL)
172				*apass = ftp_strdup(tokval);
173			break;
174		case ACCOUNT:
175			if (fstat(fileno(cfile), &stb) >= 0
176			    && (stb.st_mode & 077) != 0) {
177	warnx("Error: .netrc file is readable by others");
178	warnx("Remove account or make file unreadable by others");
179				goto bad;
180			}
181			if ((t = token()) == -1)
182				goto bad;
183			if (t && *aacct == NULL)
184				*aacct = ftp_strdup(tokval);
185			break;
186		case MACDEF:
187			if (proxy) {
188				(void)fclose(cfile);
189				return (0);
190			}
191			while ((c = getc(cfile)) != EOF)
192				if (c != ' ' && c != '\t')
193					break;
194			if (c == EOF || c == '\n') {
195				fputs("Missing macdef name argument.\n",
196				    ttyout);
197				goto bad;
198			}
199			if (macnum == 16) {
200				fputs(
201			    "Limit of 16 macros have already been defined.\n",
202				    ttyout);
203				goto bad;
204			}
205			tmp = macros[macnum].mac_name;
206			*tmp++ = c;
207			for (i = 0; i < 8 && (c = getc(cfile)) != EOF &&
208			    !isspace(c); ++i) {
209				*tmp++ = c;
210			}
211			if (c == EOF) {
212				fputs(
213			    "Macro definition missing null line terminator.\n",
214				    ttyout);
215				goto bad;
216			}
217			*tmp = '\0';
218			if (c != '\n') {
219				while ((c = getc(cfile)) != EOF && c != '\n');
220			}
221			if (c == EOF) {
222				fputs(
223			    "Macro definition missing null line terminator.\n",
224				    ttyout);
225				goto bad;
226			}
227			if (macnum == 0) {
228				macros[macnum].mac_start = macbuf;
229			}
230			else {
231				macros[macnum].mac_start =
232				    macros[macnum-1].mac_end + 1;
233			}
234			tmp = macros[macnum].mac_start;
235			while (tmp != macbuf + 4096) {
236				if ((c = getc(cfile)) == EOF) {
237					fputs(
238			    "Macro definition missing null line terminator.\n",
239					    ttyout);
240					goto bad;
241				}
242				*tmp = c;
243				if (*tmp == '\n') {
244					if (tmp == macros[macnum].mac_start) {
245						macros[macnum++].mac_end = tmp;
246						break;
247					} else if (*(tmp - 1) == '\0') {
248						macros[macnum++].mac_end =
249						    tmp - 1;
250						break;
251					}
252					*tmp = '\0';
253				}
254				tmp++;
255			}
256			if (tmp == macbuf + 4096) {
257				fputs("4K macro buffer exceeded.\n",
258				    ttyout);
259				goto bad;
260			}
261			break;
262		default:
263			warnx("Unknown .netrc keyword `%s'", tokval);
264			break;
265		}
266		goto done;
267	}
268 done:
269	if (t == -1)
270		goto bad;
271	(void)fclose(cfile);
272	return (0);
273 bad:
274	(void)fclose(cfile);
275	return (-1);
276}
277
278static int
279token(void)
280{
281	char *cp;
282	int c;
283	struct toktab *t;
284
285	if (feof(cfile) || ferror(cfile))
286		return (0);
287	while ((c = getc(cfile)) != EOF &&
288	    (c == '\n' || c == '\t' || c == ' ' || c == ','))
289		continue;
290	if (c == EOF)
291		return (0);
292	cp = tokval;
293	if (c == '"') {
294		while ((c = getc(cfile)) != EOF && c != '"') {
295			if (c == '\\')
296				if ((c = getc(cfile)) == EOF)
297					break;
298			*cp++ = c;
299			if (cp == tokval + sizeof(tokval)) {
300				warnx("Token in .netrc too long");
301				return (-1);
302			}
303		}
304	} else {
305		*cp++ = c;
306		while ((c = getc(cfile)) != EOF
307		    && c != '\n' && c != '\t' && c != ' ' && c != ',') {
308			if (c == '\\')
309				if ((c = getc(cfile)) == EOF)
310					break;
311			*cp++ = c;
312			if (cp == tokval + sizeof(tokval)) {
313				warnx("Token in .netrc too long");
314				return (-1);
315			}
316		}
317	}
318	*cp = 0;
319	if (tokval[0] == 0)
320		return (0);
321	for (t = toktab; t->tokstr; t++)
322		if (!strcmp(t->tokstr, tokval))
323			return (t->tval);
324	return (ID);
325}
326