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From d0986e46b74de3b131fccbf79bd00de5ff054f71 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 18:59:27 -0400
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Subject: [PATCH] sd-bus: do not use per-datagram auxiliary information
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SELinux information cannot be retrieved this way, since we are
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using stream unix sockets and SCM_SECURITY does not work for
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them.
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SCM_CREDENTIALS use dropped to be consistent. We also should
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get this information at connection time.
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https://bugzilla.redhat.com/show_bug.cgi?id=1224211
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"SCM_SECURITY was only added for datagram sockets."
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Cherry-picked from: d868f2a
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Related: #1230190
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---
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src/libsystemd/sd-bus/bus-socket.c | 70 +++++++-------------------------------
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1 file changed, 12 insertions(+), 58 deletions(-)
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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 52883fa8c..abd9ece01 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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@@ -501,9 +501,7 @@ static int bus_socket_read_auth(sd_bus *b) {
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void *p;
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union {
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struct cmsghdr cmsghdr;
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- uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX) +
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- CMSG_SPACE(sizeof(struct ucred)) +
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- CMSG_SPACE(NAME_MAX)]; /*selinux label */
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+ uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)];
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} control;
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struct cmsghdr *cmsg;
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bool handle_cmsg = false;
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@@ -556,8 +554,8 @@ static int bus_socket_read_auth(sd_bus *b) {
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b->rbuffer_size += k;
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- if (handle_cmsg) {
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- for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) {
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+ if (handle_cmsg)
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+ for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg))
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if (cmsg->cmsg_level == SOL_SOCKET &&
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cmsg->cmsg_type == SCM_RIGHTS) {
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int j;
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@@ -568,31 +566,9 @@ static int bus_socket_read_auth(sd_bus *b) {
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j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
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close_many((int*) CMSG_DATA(cmsg), j);
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return -EIO;
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-
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- } else if (cmsg->cmsg_level == SOL_SOCKET &&
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- cmsg->cmsg_type == SCM_CREDENTIALS &&
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- cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
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-
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- /* Ignore bogus data, which we might
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- * get on socketpair() sockets */
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- if (((struct ucred*) CMSG_DATA(cmsg))->pid != 0) {
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- memcpy(&b->ucred, CMSG_DATA(cmsg), sizeof(struct ucred));
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- b->ucred_valid = true;
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- }
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-
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- } else if (cmsg->cmsg_level == SOL_SOCKET &&
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- cmsg->cmsg_type == SCM_SECURITY) {
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-
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- size_t l;
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-
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- l = cmsg->cmsg_len - CMSG_LEN(0);
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- if (l > 0) {
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- memcpy(&b->label, CMSG_DATA(cmsg), l);
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- b->label[l] = 0;
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- }
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- }
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- }
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- }
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+ } else
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+ log_debug("Got unexpected auxiliary data with level=%d and type=%d",
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+ cmsg->cmsg_level, cmsg->cmsg_type);
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r = bus_socket_auth_verify(b);
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if (r != 0)
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@@ -945,9 +921,7 @@ int bus_socket_read_message(sd_bus *bus) {
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void *b;
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union {
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struct cmsghdr cmsghdr;
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- uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX) +
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- CMSG_SPACE(sizeof(struct ucred)) +
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- CMSG_SPACE(NAME_MAX)]; /*selinux label */
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+ uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)];
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} control;
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struct cmsghdr *cmsg;
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bool handle_cmsg = false;
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@@ -995,8 +969,8 @@ int bus_socket_read_message(sd_bus *bus) {
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bus->rbuffer_size += k;
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- if (handle_cmsg) {
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- for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) {
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+ if (handle_cmsg)
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+ for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg))
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if (cmsg->cmsg_level == SOL_SOCKET &&
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cmsg->cmsg_type == SCM_RIGHTS) {
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int n, *f;
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@@ -1021,29 +995,9 @@ int bus_socket_read_message(sd_bus *bus) {
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memcpy(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int));
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bus->fds = f;
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bus->n_fds += n;
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- } else if (cmsg->cmsg_level == SOL_SOCKET &&
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- cmsg->cmsg_type == SCM_CREDENTIALS &&
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- cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
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-
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- /* Ignore bogus data, which we might
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- * get on socketpair() sockets */
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- if (((struct ucred*) CMSG_DATA(cmsg))->pid != 0) {
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- memcpy(&bus->ucred, CMSG_DATA(cmsg), sizeof(struct ucred));
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- bus->ucred_valid = true;
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- }
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-
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- } else if (cmsg->cmsg_level == SOL_SOCKET &&
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- cmsg->cmsg_type == SCM_SECURITY) {
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-
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- size_t l;
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- l = cmsg->cmsg_len - CMSG_LEN(0);
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- if (l > 0) {
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- memcpy(&bus->label, CMSG_DATA(cmsg), l);
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- bus->label[l] = 0;
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- }
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- }
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- }
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- }
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+ } else
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+ log_debug("Got unexpected auxiliary data with level=%d and type=%d",
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+ cmsg->cmsg_level, cmsg->cmsg_type);
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r = bus_socket_read_message_need(bus, &need);
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if (r < 0)
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