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From d491fd1068446f74992e76154e5e9d57bd67e7ac Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sat, 6 Jun 2015 21:24:45 -0400
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Subject: [PATCH] sd-bus: store selinux context at connection time
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This appears to be the right time to do it for SOCK_STREAM
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unix sockets.
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Also: condition bus_get_owner_creds_dbus1 was reversed. Split
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it out to a separate variable for clarity and fix.
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https://bugzilla.redhat.com/show_bug.cgi?id=1224211
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Cherry-picked from: c4e6556
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Related: #1230190
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---
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src/libsystemd/sd-bus/bus-control.c | 6 ++++--
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src/libsystemd/sd-bus/bus-internal.h | 2 +-
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src/libsystemd/sd-bus/bus-socket.c | 7 +++++++
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src/libsystemd/sd-bus/sd-bus.c | 1 +
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4 files changed, 13 insertions(+), 3 deletions(-)
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diff --git a/src/libsystemd/sd-bus/bus-control.c b/src/libsystemd/sd-bus/bus-control.c
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index 06e5b4f..8b84b94 100644
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--- a/src/libsystemd/sd-bus/bus-control.c
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+++ b/src/libsystemd/sd-bus/bus-control.c
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@@ -945,8 +945,10 @@ static int bus_get_owner_creds_dbus1(sd_bus *bus, uint64_t mask, sd_bus_creds **
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_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
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pid_t pid = 0;
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int r;
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+ bool do_label = bus->label && (mask & SD_BUS_CREDS_SELINUX_CONTEXT);
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- if (!bus->ucred_valid && !isempty(bus->label))
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+ /* Avoid allocating anything if we have no chance of returning useful data */
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+ if (!bus->ucred_valid && !do_label)
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return -ENODATA;
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c = bus_creds_new();
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@@ -970,7 +972,7 @@ static int bus_get_owner_creds_dbus1(sd_bus *bus, uint64_t mask, sd_bus_creds **
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}
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}
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- if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) {
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+ if (do_label) {
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c->label = strdup(bus->label);
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if (!c->label)
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return -ENOMEM;
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diff --git a/src/libsystemd/sd-bus/bus-internal.h b/src/libsystemd/sd-bus/bus-internal.h
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index e9f1a81..071b3da 100644
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--- a/src/libsystemd/sd-bus/bus-internal.h
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+++ b/src/libsystemd/sd-bus/bus-internal.h
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@@ -262,7 +262,7 @@ struct sd_bus {
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usec_t auth_timeout;
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struct ucred ucred;
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- char label[NAME_MAX];
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+ char *label;
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uint64_t creds_mask;
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diff --git a/src/libsystemd/sd-bus/bus-socket.c b/src/libsystemd/sd-bus/bus-socket.c
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index abd9ece..d00cd01 100644
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--- a/src/libsystemd/sd-bus/bus-socket.c
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+++ b/src/libsystemd/sd-bus/bus-socket.c
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@@ -600,10 +600,17 @@ void bus_socket_setup(sd_bus *b) {
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}
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static void bus_get_peercred(sd_bus *b) {
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+ int r;
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+
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assert(b);
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/* Get the peer for socketpair() sockets */
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b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0;
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+
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+ /* Get the SELinux context of the peer */
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+ r = getpeersec(b->input_fd, &b->label);
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+ if (r < 0 && r != -EOPNOTSUPP)
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+ log_debug_errno(r, "Failed to determine peer security context: %m");
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}
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static int bus_socket_start_auth_client(sd_bus *b) {
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diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
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index cac9b65..b0a3237 100644
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--- a/src/libsystemd/sd-bus/sd-bus.c
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+++ b/src/libsystemd/sd-bus/sd-bus.c
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@@ -121,6 +121,7 @@ static void bus_free(sd_bus *b) {
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if (b->kdbus_buffer)
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munmap(b->kdbus_buffer, KDBUS_POOL_SIZE);
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+ free(b->label);
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free(b->rbuffer);
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free(b->unique_name);
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free(b->auth_buffer);
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