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diff --color -ru a/sftp-server.8 b/sftp-server.8
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--- a/sftp-server.8 2019-04-18 00:52:57.000000000 +0200
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+++ b/sftp-server.8 2022-06-20 16:03:47.892540068 +0200
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@@ -38,6 +38,7 @@
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.Op Fl P Ar blacklisted_requests
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.Op Fl p Ar whitelisted_requests
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.Op Fl u Ar umask
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+.Op Fl m Ar force_file_perms
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.Ek
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.Nm
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.Fl Q Ar protocol_feature
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@@ -138,6 +139,12 @@
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.Xr umask 2
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to be applied to newly-created files and directories, instead of the
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user's default mask.
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+.It Fl m Ar force_file_perms
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+Sets explicit file permissions to be applied to newly-created files instead
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+of the default or client requested mode. Numeric values include:
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+777, 755, 750, 666, 644, 640, etc. Using both -m and -u switches makes the
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+umask (-u) effective only for newly created directories and explicit mode (-m)
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+for newly created files.
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.El
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.Pp
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On some systems,
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diff --color -ru a/sftp-server.c b/sftp-server.c
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--- a/sftp-server.c 2022-06-20 16:01:26.183793633 +0200
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+++ b/sftp-server.c 2022-06-20 16:02:12.442690608 +0200
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@@ -65,6 +65,10 @@
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/* Version of client */
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static u_int version;
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+/* Force file permissions */
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+int permforce = 0;
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+long permforcemode;
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+
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/* SSH2_FXP_INIT received */
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static int init_done;
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@@ -683,6 +687,7 @@
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Attrib a;
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char *name;
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int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
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+ mode_t old_umask = 0;
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if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
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(r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
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@@ -692,6 +697,10 @@
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debug3("request %u: open flags %d", id, pflags);
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flags = flags_from_portable(pflags);
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mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
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+ if (permforce == 1) { /* Force perm if -m is set */
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+ mode = permforcemode;
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+ old_umask = umask(0); /* so umask does not interfere */
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+ }
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logit("open \"%s\" flags %s mode 0%o",
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name, string_from_portable(pflags), mode);
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if (readonly &&
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@@ -713,6 +722,8 @@
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}
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}
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}
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+ if (permforce == 1)
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+ (void) umask(old_umask); /* restore umask to something sane */
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if (status != SSH2_FX_OK)
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send_status(id, status);
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free(name);
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@@ -1555,7 +1566,7 @@
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fprintf(stderr,
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"usage: %s [-ehR] [-d start_directory] [-f log_facility] "
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"[-l log_level]\n\t[-P blacklisted_requests] "
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- "[-p whitelisted_requests] [-u umask]\n"
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+ "[-p whitelisted_requests] [-u umask] [-m force_file_perms]\n"
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" %s -Q protocol_feature\n",
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__progname, __progname);
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exit(1);
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@@ -1581,7 +1592,7 @@
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pw = pwcopy(user_pw);
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while (!skipargs && (ch = getopt(argc, argv,
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- "d:f:l:P:p:Q:u:cehR")) != -1) {
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+ "d:f:l:P:p:Q:u:m:cehR")) != -1) {
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switch (ch) {
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case 'Q':
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if (strcasecmp(optarg, "requests") != 0) {
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@@ -1643,6 +1654,15 @@
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fatal("Invalid umask \"%s\"", optarg);
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(void)umask((mode_t)mask);
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break;
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+ case 'm':
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+ /* Force permissions on file received via sftp */
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+ permforce = 1;
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+ permforcemode = strtol(optarg, &cp, 8);
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+ if (permforcemode < 0 || permforcemode > 0777 ||
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+ *cp != '\0' || (permforcemode == 0 &&
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+ errno != 0))
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+ fatal("Invalid file mode \"%s\"", optarg);
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+ break;
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case 'h':
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default:
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sftp_server_usage();
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