crypto/openssh/sftp-common.c

   1 /* $OpenBSD: sftp-common.c,v 1.30 2017/06/10 06:36:46 djm 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
  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
  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
  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
 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
 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 *
 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 *
 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         const char *user, *group;
 219         char buf[1024], lc[8], 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                 snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid);
 226                 user = ubuf;
 227                 snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid);
 228                 group = gbuf;
 229                 strlcpy(lc, "?", sizeof(lc));
 230         } else {
 231                 user = user_from_uid(st->st_uid, 0);
 232                 group = group_from_gid(st->st_gid, 0);
 233                 snprintf(lc, sizeof(lc), "%u", (u_int)st->st_nlink);
 234         }
 235         if (ltime != NULL) {
 236                 now = time(NULL);
 237                 if (now - (365*24*60*60)/2 < st->st_mtime &&
 238                     now >= st->st_mtime)
 239                         sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime);
 240                 else
 241                         sz = strftime(tbuf, sizeof tbuf, "%b %e  %Y", ltime);
 242         }
 243         if (sz == 0)
 244                 tbuf[0] = '\0';
 245         ulen = MAXIMUM(strlen(user), 8);
 246         glen = MAXIMUM(strlen(group), 8);
 247         if (si_units) {
 248                 fmt_scaled((long long)st->st_size, sbuf);
 249                 snprintf(buf, sizeof buf, "%s %3s %-*s %-*s %8s %s %s",
 250                     mode, lc, ulen, user, glen, group,
 251                     sbuf, tbuf, name);
 252         } else {
 253                 snprintf(buf, sizeof buf, "%s %3s %-*s %-*s %8llu %s %s",
 254                     mode, lc, ulen, user, glen, group,
 255                     (unsigned long long)st->st_size, tbuf, name);
 256         }
 257         return xstrdup(buf);
 258 }