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From dd46157d3faa95a12fc6f04cd2515f200e3ca465 Mon Sep 17 00:00:00 2001
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From: Frediano Ziglio <freddy77@gmail.com>
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Date: Thu, 24 Sep 2020 12:13:24 +0100
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Subject: [PATCH vd_agent_linux 09/17] vdagentd: Avoid calling chmod
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Create the socket with the right permissions using umask.
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This also prevents possible symlink exploitation in case socket
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path is not secure.
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Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
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Acked-by: Uri Lublin <uril@redhat.com>
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---
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src/vdagentd/vdagentd.c | 12 ++----------
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1 file changed, 2 insertions(+), 10 deletions(-)
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diff --git a/src/vdagentd/vdagentd.c b/src/vdagentd/vdagentd.c
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index 12cbbd0..eddfcf6 100644
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--- a/src/vdagentd/vdagentd.c
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+++ b/src/vdagentd/vdagentd.c
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@@ -1211,7 +1211,9 @@ int main(int argc, char *argv[])
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/* systemd socket activation not enabled, create our own */
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#endif /* WITH_SYSTEMD_SOCKET_ACTIVATION */
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{
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+ mode_t mode = umask(0111);
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udscs_server_listen_to_address(server, vdagentd_socket, &err;;
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+ umask(mode);
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}
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if (err) {
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@@ -1222,16 +1224,6 @@ int main(int argc, char *argv[])
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return 1;
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}
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- /* no need to set permissions on a socket that was provided by systemd */
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- if (own_socket) {
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- if (chmod(vdagentd_socket, 0666)) {
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- syslog(LOG_CRIT, "Fatal could not change permissions on %s: %m",
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- vdagentd_socket);
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- udscs_destroy_server(server);
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- return 1;
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- }
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- }
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-
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#ifdef WITH_STATIC_UINPUT
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uinput = vdagentd_uinput_create(uinput_device, 1024, 768, NULL, 0,
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debug > 1, uinput_fake);
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--
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2.26.2
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