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1 /* $OpenBSD: sftp-common.c,v 1.29 2016/09/12 01:22:38 deraadt Exp $ */
2 /*
3  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
4  * Copyright (c) 2001 Damien Miller.  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  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #include "includes.h"
28 
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 
32 #include <grp.h>
33 #include <pwd.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <time.h>
38 #include <stdarg.h>
39 #ifdef HAVE_UTIL_H
40 #include <util.h>
41 #endif
42 
43 #include "xmalloc.h"
44 #include "ssherr.h"
45 #include "sshbuf.h"
46 #include "log.h"
47 #include "misc.h"
48 
49 #include "sftp.h"
50 #include "sftp-common.h"
51 
52 /* Clear contents of attributes structure */
53 void
attrib_clear(Attrib * a)54 attrib_clear(Attrib *a)
55 {
56 	a->flags = 0;
57 	a->size = 0;
58 	a->uid = 0;
59 	a->gid = 0;
60 	a->perm = 0;
61 	a->atime = 0;
62 	a->mtime = 0;
63 }
64 
65 /* Convert from struct stat to filexfer attribs */
66 void
stat_to_attrib(const struct stat * st,Attrib * a)67 stat_to_attrib(const struct stat *st, Attrib *a)
68 {
69 	attrib_clear(a);
70 	a->flags = 0;
71 	a->flags |= SSH2_FILEXFER_ATTR_SIZE;
72 	a->size = st->st_size;
73 	a->flags |= SSH2_FILEXFER_ATTR_UIDGID;
74 	a->uid = st->st_uid;
75 	a->gid = st->st_gid;
76 	a->flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
77 	a->perm = st->st_mode;
78 	a->flags |= SSH2_FILEXFER_ATTR_ACMODTIME;
79 	a->atime = st->st_atime;
80 	a->mtime = st->st_mtime;
81 }
82 
83 /* Convert from filexfer attribs to struct stat */
84 void
attrib_to_stat(const Attrib * a,struct stat * st)85 attrib_to_stat(const Attrib *a, struct stat *st)
86 {
87 	memset(st, 0, sizeof(*st));
88 
89 	if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
90 		st->st_size = a->size;
91 	if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
92 		st->st_uid = a->uid;
93 		st->st_gid = a->gid;
94 	}
95 	if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
96 		st->st_mode = a->perm;
97 	if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
98 		st->st_atime = a->atime;
99 		st->st_mtime = a->mtime;
100 	}
101 }
102 
103 /* Decode attributes in buffer */
104 int
decode_attrib(struct sshbuf * b,Attrib * a)105 decode_attrib(struct sshbuf *b, Attrib *a)
106 {
107 	int r;
108 
109 	attrib_clear(a);
110 	if ((r = sshbuf_get_u32(b, &a->flags)) != 0)
111 		return r;
112 	if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
113 		if ((r = sshbuf_get_u64(b, &a->size)) != 0)
114 			return r;
115 	}
116 	if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
117 		if ((r = sshbuf_get_u32(b, &a->uid)) != 0 ||
118 		    (r = sshbuf_get_u32(b, &a->gid)) != 0)
119 			return r;
120 	}
121 	if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
122 		if ((r = sshbuf_get_u32(b, &a->perm)) != 0)
123 			return r;
124 	}
125 	if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
126 		if ((r = sshbuf_get_u32(b, &a->atime)) != 0 ||
127 		    (r = sshbuf_get_u32(b, &a->mtime)) != 0)
128 			return r;
129 	}
130 	/* vendor-specific extensions */
131 	if (a->flags & SSH2_FILEXFER_ATTR_EXTENDED) {
132 		char *type;
133 		u_char *data;
134 		size_t dlen;
135 		u_int i, count;
136 
137 		if ((r = sshbuf_get_u32(b, &count)) != 0)
138 			fatal("%s: buffer error: %s", __func__, ssh_err(r));
139 		for (i = 0; i < count; i++) {
140 			if ((r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
141 			    (r = sshbuf_get_string(b, &data, &dlen)) != 0)
142 				return r;
143 			debug3("Got file attribute \"%.100s\" len %zu",
144 			    type, dlen);
145 			free(type);
146 			free(data);
147 		}
148 	}
149 	return 0;
150 }
151 
152 /* Encode attributes to buffer */
153 int
encode_attrib(struct sshbuf * b,const Attrib * a)154 encode_attrib(struct sshbuf *b, const Attrib *a)
155 {
156 	int r;
157 
158 	if ((r = sshbuf_put_u32(b, a->flags)) != 0)
159 		return r;
160 	if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
161 		if ((r = sshbuf_put_u64(b, a->size)) != 0)
162 			return r;
163 	}
164 	if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
165 		if ((r = sshbuf_put_u32(b, a->uid)) != 0 ||
166 		    (r = sshbuf_put_u32(b, a->gid)) != 0)
167 			return r;
168 	}
169 	if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
170 		if ((r = sshbuf_put_u32(b, a->perm)) != 0)
171 			return r;
172 	}
173 	if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
174 		if ((r = sshbuf_put_u32(b, a->atime)) != 0 ||
175 		    (r = sshbuf_put_u32(b, a->mtime)) != 0)
176 			return r;
177 	}
178 	return 0;
179 }
180 
181 /* Convert from SSH2_FX_ status to text error message */
182 const char *
fx2txt(int status)183 fx2txt(int status)
184 {
185 	switch (status) {
186 	case SSH2_FX_OK:
187 		return("No error");
188 	case SSH2_FX_EOF:
189 		return("End of file");
190 	case SSH2_FX_NO_SUCH_FILE:
191 		return("No such file or directory");
192 	case SSH2_FX_PERMISSION_DENIED:
193 		return("Permission denied");
194 	case SSH2_FX_FAILURE:
195 		return("Failure");
196 	case SSH2_FX_BAD_MESSAGE:
197 		return("Bad message");
198 	case SSH2_FX_NO_CONNECTION:
199 		return("No connection");
200 	case SSH2_FX_CONNECTION_LOST:
201 		return("Connection lost");
202 	case SSH2_FX_OP_UNSUPPORTED:
203 		return("Operation unsupported");
204 	default:
205 		return("Unknown status");
206 	}
207 	/* NOTREACHED */
208 }
209 
210 /*
211  * drwxr-xr-x    5 markus   markus       1024 Jan 13 18:39 .ssh
212  */
213 char *
ls_file(const char * name,const struct stat * st,int remote,int si_units)214 ls_file(const char *name, const struct stat *st, int remote, int si_units)
215 {
216 	int ulen, glen, sz = 0;
217 	struct tm *ltime = localtime(&st->st_mtime);
218 	char *user, *group;
219 	char buf[1024], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1];
220 	char sbuf[FMT_SCALED_STRSIZE];
221 	time_t now;
222 
223 	strmode(st->st_mode, mode);
224 	if (!remote) {
225 		user = user_from_uid(st->st_uid, 0);
226 	} else {
227 		snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid);
228 		user = ubuf;
229 	}
230 	if (!remote) {
231 		group = group_from_gid(st->st_gid, 0);
232 	} else {
233 		snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid);
234 		group = gbuf;
235 	}
236 	if (ltime != NULL) {
237 		now = time(NULL);
238 		if (now - (365*24*60*60)/2 < st->st_mtime &&
239 		    now >= st->st_mtime)
240 			sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime);
241 		else
242 			sz = strftime(tbuf, sizeof tbuf, "%b %e  %Y", ltime);
243 	}
244 	if (sz == 0)
245 		tbuf[0] = '\0';
246 	ulen = MAXIMUM(strlen(user), 8);
247 	glen = MAXIMUM(strlen(group), 8);
248 	if (si_units) {
249 		fmt_scaled((long long)st->st_size, sbuf);
250 		snprintf(buf, sizeof buf, "%s %3u %-*s %-*s %8s %s %s", mode,
251 		    (u_int)st->st_nlink, ulen, user, glen, group,
252 		    sbuf, tbuf, name);
253 	} else {
254 		snprintf(buf, sizeof buf, "%s %3u %-*s %-*s %8llu %s %s", mode,
255 		    (u_int)st->st_nlink, ulen, user, glen, group,
256 		    (unsigned long long)st->st_size, tbuf, name);
257 	}
258 	return xstrdup(buf);
259 }
260