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From e13d53326bc154c684ea1bef9efc5922b5228945 Mon Sep 17 00:00:00 2001
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From: Jakub Hrozek <jhrozek@redhat.com>
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Date: Fri, 15 Jun 2018 22:29:34 +0200
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Subject: [PATCH] SUDO: Create the socket with stricter permissions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This patch switches the sudo responder from being created as a public
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responder where the permissions are open and not checked by the sssd
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deaamon to a private socket. In this case, sssd creates the pipes with
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strict permissions (see the umask in the call to create_pipe_fd() in
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set_unix_socket()) and additionaly checks the permissions with every read
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via the tevent integrations (see accept_fd_handler()).
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Resolves:
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https://pagure.io/SSSD/sssd/issue/3766 (CVE-2018-10852)
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Reviewed-by: Sumit Bose <sbose@redhat.com>
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Reviewed-by: Pavel Březina <pbrezina@redhat.com>
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(cherry picked from commit ed90a20a0f0e936eb00d268080716c0384ffb01d)
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DOWNSTREAM:
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Resolves: rhbz#1590603 - EMBARGOED CVE-2018-10852 sssd: information leak from the sssd-sudo responder [rhel-7]
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---
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src/responder/sudo/sudosrv.c | 3 ++-
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src/sysv/systemd/sssd-sudo.socket.in | 1 +
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2 files changed, 3 insertions(+), 1 deletion(-)
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diff --git a/src/responder/sudo/sudosrv.c b/src/responder/sudo/sudosrv.c
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index ac4258710d3a9b48285522abd23bdd59ba42ad4e..e87a24499c2d82fafaa8e1f9b386e44332394266 100644
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--- a/src/responder/sudo/sudosrv.c
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+++ b/src/responder/sudo/sudosrv.c
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@@ -79,7 +79,8 @@ int sudo_process_init(TALLOC_CTX *mem_ctx,
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sudo_cmds = get_sudo_cmds();
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ret = sss_process_init(mem_ctx, ev, cdb,
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sudo_cmds,
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- SSS_SUDO_SOCKET_NAME, -1, NULL, -1,
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+ NULL, -1, /* No public socket */
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+ SSS_SUDO_SOCKET_NAME, -1, /* Private socket only */
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CONFDB_SUDO_CONF_ENTRY,
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SSS_SUDO_SBUS_SERVICE_NAME,
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SSS_SUDO_SBUS_SERVICE_VERSION,
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diff --git a/src/sysv/systemd/sssd-sudo.socket.in b/src/sysv/systemd/sssd-sudo.socket.in
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index c9abb875f0accbaf58d78846020fef74c7473528..96a8b0327ddb4d331c9b2e97ece3453f8f76872d 100644
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--- a/src/sysv/systemd/sssd-sudo.socket.in
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+++ b/src/sysv/systemd/sssd-sudo.socket.in
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@@ -11,6 +11,7 @@ ExecStartPre=@libexecdir@/sssd/sssd_check_socket_activated_responders -r sudo
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ListenStream=@pipepath@/sudo
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SocketUser=@SSSD_USER@
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SocketGroup=@SSSD_USER@
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+SocketMode=0600
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[Install]
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WantedBy=sssd.service
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--
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2.17.1
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