1 /* $OpenBSD: sftp-common.c,v 1.32 2020/10/18 11:32:02 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 __RCSID("$FreeBSD$"); 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 #include <unistd.h> 41 #ifdef HAVE_UTIL_H 42 #include <util.h> 43 #endif 44 45 #include "xmalloc.h" 46 #include "ssherr.h" 47 #include "sshbuf.h" 48 #include "log.h" 49 #include "misc.h" 50 51 #include "sftp.h" 52 #include "sftp-common.h" 53 54 /* Clear contents of attributes structure */ 55 void 56 attrib_clear(Attrib *a) 57 { 58 a->flags = 0; 59 a->size = 0; 60 a->uid = 0; 61 a->gid = 0; 62 a->perm = 0; 63 a->atime = 0; 64 a->mtime = 0; 65 } 66 67 /* Convert from struct stat to filexfer attribs */ 68 void 69 stat_to_attrib(const struct stat *st, Attrib *a) 70 { 71 attrib_clear(a); 72 a->flags = 0; 73 a->flags |= SSH2_FILEXFER_ATTR_SIZE; 74 a->size = st->st_size; 75 a->flags |= SSH2_FILEXFER_ATTR_UIDGID; 76 a->uid = st->st_uid; 77 a->gid = st->st_gid; 78 a->flags |= SSH2_FILEXFER_ATTR_PERMISSIONS; 79 a->perm = st->st_mode; 80 a->flags |= SSH2_FILEXFER_ATTR_ACMODTIME; 81 a->atime = st->st_atime; 82 a->mtime = st->st_mtime; 83 } 84 85 /* Convert from filexfer attribs to struct stat */ 86 void 87 attrib_to_stat(const Attrib *a, struct stat *st) 88 { 89 memset(st, 0, sizeof(*st)); 90 91 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) 92 st->st_size = a->size; 93 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 94 st->st_uid = a->uid; 95 st->st_gid = a->gid; 96 } 97 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) 98 st->st_mode = a->perm; 99 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 100 st->st_atime = a->atime; 101 st->st_mtime = a->mtime; 102 } 103 } 104 105 /* Decode attributes in buffer */ 106 int 107 decode_attrib(struct sshbuf *b, Attrib *a) 108 { 109 int r; 110 111 attrib_clear(a); 112 if ((r = sshbuf_get_u32(b, &a->flags)) != 0) 113 return r; 114 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 115 if ((r = sshbuf_get_u64(b, &a->size)) != 0) 116 return r; 117 } 118 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 119 if ((r = sshbuf_get_u32(b, &a->uid)) != 0 || 120 (r = sshbuf_get_u32(b, &a->gid)) != 0) 121 return r; 122 } 123 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 124 if ((r = sshbuf_get_u32(b, &a->perm)) != 0) 125 return r; 126 } 127 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 128 if ((r = sshbuf_get_u32(b, &a->atime)) != 0 || 129 (r = sshbuf_get_u32(b, &a->mtime)) != 0) 130 return r; 131 } 132 /* vendor-specific extensions */ 133 if (a->flags & SSH2_FILEXFER_ATTR_EXTENDED) { 134 char *type; 135 u_char *data; 136 size_t dlen; 137 u_int i, count; 138 139 if ((r = sshbuf_get_u32(b, &count)) != 0) 140 return r; 141 for (i = 0; i < count; i++) { 142 if ((r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 143 (r = sshbuf_get_string(b, &data, &dlen)) != 0) 144 return r; 145 debug3("Got file attribute \"%.100s\" len %zu", 146 type, dlen); 147 free(type); 148 free(data); 149 } 150 } 151 return 0; 152 } 153 154 /* Encode attributes to buffer */ 155 int 156 encode_attrib(struct sshbuf *b, const Attrib *a) 157 { 158 int r; 159 160 if ((r = sshbuf_put_u32(b, a->flags)) != 0) 161 return r; 162 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 163 if ((r = sshbuf_put_u64(b, a->size)) != 0) 164 return r; 165 } 166 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 167 if ((r = sshbuf_put_u32(b, a->uid)) != 0 || 168 (r = sshbuf_put_u32(b, a->gid)) != 0) 169 return r; 170 } 171 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 172 if ((r = sshbuf_put_u32(b, a->perm)) != 0) 173 return r; 174 } 175 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 176 if ((r = sshbuf_put_u32(b, a->atime)) != 0 || 177 (r = sshbuf_put_u32(b, a->mtime)) != 0) 178 return r; 179 } 180 return 0; 181 } 182 183 /* Convert from SSH2_FX_ status to text error message */ 184 const char * 185 fx2txt(int status) 186 { 187 switch (status) { 188 case SSH2_FX_OK: 189 return("No error"); 190 case SSH2_FX_EOF: 191 return("End of file"); 192 case SSH2_FX_NO_SUCH_FILE: 193 return("No such file or directory"); 194 case SSH2_FX_PERMISSION_DENIED: 195 return("Permission denied"); 196 case SSH2_FX_FAILURE: 197 return("Failure"); 198 case SSH2_FX_BAD_MESSAGE: 199 return("Bad message"); 200 case SSH2_FX_NO_CONNECTION: 201 return("No connection"); 202 case SSH2_FX_CONNECTION_LOST: 203 return("Connection lost"); 204 case SSH2_FX_OP_UNSUPPORTED: 205 return("Operation unsupported"); 206 default: 207 return("Unknown status"); 208 } 209 /* NOTREACHED */ 210 } 211 212 /* 213 * drwxr-xr-x 5 markus markus 1024 Jan 13 18:39 .ssh 214 */ 215 char * 216 ls_file(const char *name, const struct stat *st, int remote, int si_units) 217 { 218 int ulen, glen, sz = 0; 219 struct tm *ltime = localtime(&st->st_mtime); 220 const char *user, *group; 221 char buf[1024], lc[8], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1]; 222 char sbuf[FMT_SCALED_STRSIZE]; 223 time_t now; 224 225 strmode(st->st_mode, mode); 226 if (remote) { 227 snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid); 228 user = ubuf; 229 snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid); 230 group = gbuf; 231 strlcpy(lc, "?", sizeof(lc)); 232 } else { 233 user = user_from_uid(st->st_uid, 0); 234 group = group_from_gid(st->st_gid, 0); 235 snprintf(lc, sizeof(lc), "%u", (u_int)st->st_nlink); 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 %3s %-*s %-*s %8s %s %s", 252 mode, lc, ulen, user, glen, group, 253 sbuf, tbuf, name); 254 } else { 255 snprintf(buf, sizeof buf, "%s %3s %-*s %-*s %8llu %s %s", 256 mode, lc, ulen, user, glen, group, 257 (unsigned long long)st->st_size, tbuf, name); 258 } 259 return xstrdup(buf); 260 } 261