openssh/openssh-6.7p1-sftp-force-permission.patch
2020-09-29 14:53:14 +02:00

101 lines
3.4 KiB
Diff

diff -up openssh-7.2p2/sftp-server.8.sftp-force-mode openssh-7.2p2/sftp-server.8
--- openssh-7.2p2/sftp-server.8.sftp-force-mode 2016-03-09 19:04:48.000000000 +0100
+++ openssh-7.2p2/sftp-server.8 2016-06-23 16:18:20.463854117 +0200
@@ -38,6 +38,7 @@
.Op Fl P Ar denied_requests
.Op Fl p Ar allowed_requests
.Op Fl u Ar umask
+.Op Fl m Ar force_file_perms
.Ek
.Nm
.Fl Q Ar protocol_feature
@@ -138,6 +139,12 @@ Sets an explicit
.Xr umask 2
to be applied to newly-created files and directories, instead of the
user's default mask.
+.It Fl m Ar force_file_perms
+Sets explicit file permissions to be applied to newly-created files instead
+of the default or client requested mode. Numeric values include:
+777, 755, 750, 666, 644, 640, etc. Using both -m and -u switches makes the
+umask (-u) effective only for newly created directories and explicit mode (-m)
+for newly created files.
.El
.Pp
On some systems,
diff -up openssh-7.2p2/sftp-server.c.sftp-force-mode openssh-7.2p2/sftp-server.c
--- openssh-7.2p2/sftp-server.c.sftp-force-mode 2016-06-23 16:18:20.446854128 +0200
+++ openssh-7.2p2/sftp-server.c 2016-06-23 16:20:37.950766082 +0200
@@ -69,6 +69,10 @@ struct sshbuf *oqueue;
/* Version of client */
static u_int version;
+/* Force file permissions */
+int permforce = 0;
+long permforcemode;
+
/* SSH2_FXP_INIT received */
static int init_done;
@@ -683,6 +687,7 @@ process_open(u_int32_t id)
Attrib a;
char *name;
int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
+ mode_t old_umask = 0;
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
(r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
@@ -692,6 +697,10 @@ process_open(u_int32_t id)
debug3("request %u: open flags %d", id, pflags);
flags = flags_from_portable(pflags);
mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
+ if (permforce == 1) { /* Force perm if -m is set */
+ mode = permforcemode;
+ old_umask = umask(0); /* so umask does not interfere */
+ }
logit("open \"%s\" flags %s mode 0%o",
name, string_from_portable(pflags), mode);
if (readonly &&
@@ -713,6 +722,8 @@ process_open(u_int32_t id)
}
}
}
+ if (permforce == 1)
+ (void) umask(old_umask); /* restore umask to something sane */
if (status != SSH2_FX_OK)
send_status(id, status);
free(name);
@@ -1494,7 +1505,7 @@ sftp_server_usage(void)
fprintf(stderr,
"usage: %s [-ehR] [-d start_directory] [-f log_facility] "
"[-l log_level]\n\t[-P denied_requests] "
- "[-p allowed_requests] [-u umask]\n"
+ "[-p allowed_requests] [-u umask] [-m force_file_perms]\n"
" %s -Q protocol_feature\n",
__progname, __progname);
exit(1);
@@ -1520,7 +1531,7 @@ sftp_server_main(int argc, char **argv,
pw = pwcopy(user_pw);
while (!skipargs && (ch = getopt(argc, argv,
- "d:f:l:P:p:Q:u:cehR")) != -1) {
+ "d:f:l:P:p:Q:u:m:cehR")) != -1) {
switch (ch) {
case 'Q':
if (strcasecmp(optarg, "requests") != 0) {
@@ -1580,6 +1591,15 @@ sftp_server_main(int argc, char **argv,
fatal("Invalid umask \"%s\"", optarg);
(void)umask((mode_t)mask);
break;
+ case 'm':
+ /* Force permissions on file received via sftp */
+ permforce = 1;
+ permforcemode = strtol(optarg, &cp, 8);
+ if (permforcemode < 0 || permforcemode > 0777 ||
+ *cp != '\0' || (permforcemode == 0 &&
+ errno != 0))
+ fatal("Invalid file mode \"%s\"", optarg);
+ break;
case 'h':
default:
sftp_server_usage();