sftp-common.c revision 323134
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__RCSID("$FreeBSD: stable/11/crypto/openssh/sftp-common.c 323134 2017-09-02 21:58:42Z des $"); 29 30#include <sys/types.h> 31#include <sys/stat.h> 32 33#include <grp.h> 34#include <pwd.h> 35#include <stdio.h> 36#include <stdlib.h> 37#include <string.h> 38#include <time.h> 39#include <stdarg.h> 40#ifdef HAVE_UTIL_H 41#include <util.h> 42#endif 43 44#include "xmalloc.h" 45#include "ssherr.h" 46#include "sshbuf.h" 47#include "log.h" 48#include "misc.h" 49 50#include "sftp.h" 51#include "sftp-common.h" 52 53/* Clear contents of attributes structure */ 54void 55attrib_clear(Attrib *a) 56{ 57 a->flags = 0; 58 a->size = 0; 59 a->uid = 0; 60 a->gid = 0; 61 a->perm = 0; 62 a->atime = 0; 63 a->mtime = 0; 64} 65 66/* Convert from struct stat to filexfer attribs */ 67void 68stat_to_attrib(const struct stat *st, Attrib *a) 69{ 70 attrib_clear(a); 71 a->flags = 0; 72 a->flags |= SSH2_FILEXFER_ATTR_SIZE; 73 a->size = st->st_size; 74 a->flags |= SSH2_FILEXFER_ATTR_UIDGID; 75 a->uid = st->st_uid; 76 a->gid = st->st_gid; 77 a->flags |= SSH2_FILEXFER_ATTR_PERMISSIONS; 78 a->perm = st->st_mode; 79 a->flags |= SSH2_FILEXFER_ATTR_ACMODTIME; 80 a->atime = st->st_atime; 81 a->mtime = st->st_mtime; 82} 83 84/* Convert from filexfer attribs to struct stat */ 85void 86attrib_to_stat(const Attrib *a, struct stat *st) 87{ 88 memset(st, 0, sizeof(*st)); 89 90 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) 91 st->st_size = a->size; 92 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 93 st->st_uid = a->uid; 94 st->st_gid = a->gid; 95 } 96 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) 97 st->st_mode = a->perm; 98 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 99 st->st_atime = a->atime; 100 st->st_mtime = a->mtime; 101 } 102} 103 104/* Decode attributes in buffer */ 105int 106decode_attrib(struct sshbuf *b, Attrib *a) 107{ 108 int r; 109 110 attrib_clear(a); 111 if ((r = sshbuf_get_u32(b, &a->flags)) != 0) 112 return r; 113 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 114 if ((r = sshbuf_get_u64(b, &a->size)) != 0) 115 return r; 116 } 117 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 118 if ((r = sshbuf_get_u32(b, &a->uid)) != 0 || 119 (r = sshbuf_get_u32(b, &a->gid)) != 0) 120 return r; 121 } 122 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 123 if ((r = sshbuf_get_u32(b, &a->perm)) != 0) 124 return r; 125 } 126 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 127 if ((r = sshbuf_get_u32(b, &a->atime)) != 0 || 128 (r = sshbuf_get_u32(b, &a->mtime)) != 0) 129 return r; 130 } 131 /* vendor-specific extensions */ 132 if (a->flags & SSH2_FILEXFER_ATTR_EXTENDED) { 133 char *type; 134 u_char *data; 135 size_t dlen; 136 u_int i, count; 137 138 if ((r = sshbuf_get_u32(b, &count)) != 0) 139 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 140 for (i = 0; i < count; i++) { 141 if ((r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 142 (r = sshbuf_get_string(b, &data, &dlen)) != 0) 143 return r; 144 debug3("Got file attribute \"%.100s\" len %zu", 145 type, dlen); 146 free(type); 147 free(data); 148 } 149 } 150 return 0; 151} 152 153/* Encode attributes to buffer */ 154int 155encode_attrib(struct sshbuf *b, const Attrib *a) 156{ 157 int r; 158 159 if ((r = sshbuf_put_u32(b, a->flags)) != 0) 160 return r; 161 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 162 if ((r = sshbuf_put_u64(b, a->size)) != 0) 163 return r; 164 } 165 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 166 if ((r = sshbuf_put_u32(b, a->uid)) != 0 || 167 (r = sshbuf_put_u32(b, a->gid)) != 0) 168 return r; 169 } 170 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 171 if ((r = sshbuf_put_u32(b, a->perm)) != 0) 172 return r; 173 } 174 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 175 if ((r = sshbuf_put_u32(b, a->atime)) != 0 || 176 (r = sshbuf_put_u32(b, a->mtime)) != 0) 177 return r; 178 } 179 return 0; 180} 181 182/* Convert from SSH2_FX_ status to text error message */ 183const char * 184fx2txt(int status) 185{ 186 switch (status) { 187 case SSH2_FX_OK: 188 return("No error"); 189 case SSH2_FX_EOF: 190 return("End of file"); 191 case SSH2_FX_NO_SUCH_FILE: 192 return("No such file or directory"); 193 case SSH2_FX_PERMISSION_DENIED: 194 return("Permission denied"); 195 case SSH2_FX_FAILURE: 196 return("Failure"); 197 case SSH2_FX_BAD_MESSAGE: 198 return("Bad message"); 199 case SSH2_FX_NO_CONNECTION: 200 return("No connection"); 201 case SSH2_FX_CONNECTION_LOST: 202 return("Connection lost"); 203 case SSH2_FX_OP_UNSUPPORTED: 204 return("Operation unsupported"); 205 default: 206 return("Unknown status"); 207 } 208 /* NOTREACHED */ 209} 210 211/* 212 * drwxr-xr-x 5 markus markus 1024 Jan 13 18:39 .ssh 213 */ 214char * 215ls_file(const char *name, const struct stat *st, int remote, int si_units) 216{ 217 int ulen, glen, sz = 0; 218 struct tm *ltime = localtime(&st->st_mtime); 219 const char *user, *group; 220 char buf[1024], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1]; 221 char sbuf[FMT_SCALED_STRSIZE]; 222 time_t now; 223 224 strmode(st->st_mode, mode); 225 if (!remote) { 226 user = user_from_uid(st->st_uid, 0); 227 } else { 228 snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid); 229 user = ubuf; 230 } 231 if (!remote) { 232 group = group_from_gid(st->st_gid, 0); 233 } else { 234 snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid); 235 group = gbuf; 236 } 237 if (ltime != NULL) { 238 now = time(NULL); 239 if (now - (365*24*60*60)/2 < st->st_mtime && 240 now >= st->st_mtime) 241 sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime); 242 else 243 sz = strftime(tbuf, sizeof tbuf, "%b %e %Y", ltime); 244 } 245 if (sz == 0) 246 tbuf[0] = '\0'; 247 ulen = MAXIMUM(strlen(user), 8); 248 glen = MAXIMUM(strlen(group), 8); 249 if (si_units) { 250 fmt_scaled((long long)st->st_size, sbuf); 251 snprintf(buf, sizeof buf, "%s %3u %-*s %-*s %8s %s %s", mode, 252 (u_int)st->st_nlink, ulen, user, glen, group, 253 sbuf, tbuf, name); 254 } else { 255 snprintf(buf, sizeof buf, "%s %3u %-*s %-*s %8llu %s %s", mode, 256 (u_int)st->st_nlink, ulen, user, glen, group, 257 (unsigned long long)st->st_size, tbuf, name); 258 } 259 return xstrdup(buf); 260} 261